Text

Proposed Tech Specs Supporting Application to Amend License Re Modified Electrical Distribution Sys
	ML18025B694
Person / Time
Site:	Browns Ferry
Issue date:	12/11/1981
From:	; TENNESSEE VALLEY AUTHORITY
To:	;
Shared Package
ML18025B696	List: ML18025B694; ML20039B713;
References
	NUDOCS 8112230460
	Download: ML18025B694 (166)
	v • d • e

ENCLOSURE 1

PROPOSED TECHNICAL SPECIFICATION CHANGES BROWNS FERRY NUCLEAR PLANT UNIT 3 (DOCKET NO. 50-296).

8i i2230460 Bii2ii PDR ADOCK 05000296 t

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LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9 AUXILIARYELECTRICAL SYSTEM 4

9 AUXILIARYELECTRICAL SYSTEM A licabilit Applies to the auxiliary elec-trical power system.

Applies to the periodic testing requirements of the auxiliary electrical systems.

Ob ective To assure an adequate supply of electrical power for operation of those systems required for safety.

~Ob 'ective Verify the operability of the auxiliary electrical system.

S ecification A. Auxiliar Electrical

~Eui ment A. Auxiliar Electrical E ui>ment

l. Diesel Generators

1. The reactor shall not be started up (made critical from the cold condition) unless the following are satisfied:

a. Diesel generators 3A, 3B, 3C, and 3D operable.

b. Requirements 3.9.A,3 through 3.9.A.6 are met.

a.

Each unit 3 diesel generator shall be manually started and loaded once each month to demonstrate operational readiness.

The test shall continue for at least a one-hour period at 75% of rated load or greater.

316

1.1MITING COiNDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9 AUXILIARYELECTRICAL SYSTEM 4.9 AUXILIARYELECTRICAL SYSTEM

c. At least two of the following offsite power sources are available:

1. The 500-kV system is available to the unit 3 shutdown boards through the unit 3 station ser-vice transformer TUSS 38 wit:h no cred iL taken for. the Lwo 500-kV Trinity lines During the monthly gen-erator test the diesel generator starting air compressor shall be checked for operation and its ability to recharge air receivers.

The operation of the diesel fuel oil transfer pumps shall be demonstrated and the diesel starting t:ime to roach r:!ted voltage

<<nd speed shall be logged.

2. The Trinity 161-kV line is available to thc unit 3 shutdown boards through a

common station ser-vice or cooling tower transformer.

3. Until June 1, 1983, the Athens 161-kV line can be consid-ered an offsite source if it is

~

available to the unit 3 shutdown boards through a

common st<<L'ion service or cooling, tower trans-former not operating in parallel with source (2) above.

b. Once per operating cycle, a

test will be conducted simu-lating a loss of offsite power and similar conditions that would exist with the presence of an actual safety-injection signal to demon-strate the following:

1. Deenergization of the emergency buses and load shedding from the emer-gency buses.

2.

The diesel starts from amb,lent'ond1t lon on t,ho QUL'0 stnrL sign; ! I ence gizes the emergency buses with permanently connect:ed

loads, energizes the auto-connected emergency loads through the load sequencer,.

and operates for greater than or equal to five minutes while its genera-tor is loaded with the emergency loads.

317

0

LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9 AUXILIARY ELECTRICAL SYSTEM 4.9 AUXILIARYELECTRICAL SYSTEM A. 2. The reactor shall not be started up (made critical) from the hot standby con-dition unless all of the following conditions are satisfied:

a. At least one offsite power source is avail-able as specified in 3.9.A.l.c.

b. Three unit 3 diesel generators shall be operable.

c.

An additional source of power consisting of one of the following:

l. A second offsite power source avail-able as specified in 3.9.A.l.c.

2.

A fourth unit 3

diesel generator operable.

3.

On diesel generator breaker trip, the loads are shed from the emer-gency buses and the diesel restarts on the auto-start signal, the emer-gency buses are energized with permanently connected

loads, the auto-connected emergency loads are ener-gized through the load sequenccr p and the dies('.I operates for greater than or equal to five minutes while its generator is

.loaded with the emergency loads.

c.

Once a month the quanti.ty of diesel fuel available shall be logged.

d. Each diesel generator shall be given an annual inspec-tion in accordance with instructions based on the manufacturer's recommenda-tions ~

e.

Once a month a sample of-diesel fuel shall be checked for quality.

The quality shall be within acceptable limits specified in Table 1

of the latest revision to ASTH D975 and logged.

2. D.C. Power System - Unit Batteries (250-Volt) and Diesel Generator Batteries (125-Volt) and Shutdown Board Battery (250-Volt)

a. Every week the specific gra'vity and the voltage of the pilot cell, and temp-erature of an adjacent cell and overall battery voltage shall be measured"and logged.

318

l LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9 AUXILIARYELECTRICAL SYSTEM 4-9 AUXILIARYELECTRICAl, SYSTEM

b. Every three months the measurements shall be made of voltage of each cell to nearest 0.1 volt, specific gravity of each

cell, and temperature of every fifth cell.

These measurements shall be loggede c.

A battery rated discharge (capacity) test shall be performed and the voltage, time, and output current measurements shall be logged at intervals not to exceed 24 months.

3. Logic Systems

a. Both divisions of the accident signal logic system shall be tested every 6 months to demon-strate that it will func-tion on actuation of the core spray system of the reactor to provide an auto-matic start signal to all 4

diesel generators.

319

L1.'IITINC CONDITIONS FOR OPI RATION SUILVEILI,ANCE RI'.QU LREi~IElITS 3 ~ 9 AU:<<i?I.IARY ELECTRICAI SYSTEM!

4.9 AUXII.IARY I'.l.l'.CTPTCAL SYST!'.:.'.

A. 3.

Buses and Boards Availa hie

>, Th<espQctive stl>L t bus is energized for Q;>'h co>an>on station service transformer.

designated as an off-site power source.

b.

The 4-RV hus tie bo;>rd I!> Qn<:rgi ze<l

.I.f n coo I-ing towQL tL:>nsfo>

nl<L's design<>tQ<l as

'>n of f'ite power source.

4 ~

Und<.'Lvo I L<<>g<'t<<<l<<>vs a e (dQ)et<'d) b.

Once every 6 tnont;hs, t:he co>>ditions un<)or which t;he loss of voltage and d e:;rad-ed voltage r<>laysare re-

wit'h:>n un<le> vol t:>;<<e

<>n Q;><;l> shutdown

)>><l to

<I<'nl<>>>st L<<>to t I'><<'>t t;h<'>ssoc I:>t<.<l

<I ius<. I I;Qnerat:or wilL start.

c.

Shut:down boards (3EA,>

3EH, 3EC, 3ED) are en-ergized.

d.

Tl>e 480-V shutdown boards 3A and 3B are energized.

e.

Loss of voltage and degraded voltage relays operable on 4-kV shut-down boards,

3EA, 3EH, 3)X, and 3EI).

Tl><

~ '<80V

<l.ius<>L Aux.

Hoar<la 31'.A '>nd 3)'.II t>r<.

QQQL gized g.

The

'>80V Rx.

IIOV Boards D

& E are energized with 1I-G Sets

3DN, 3DA 3E<N, and 3EA in service.

320

LDIITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9 AUXILIARYELECTRICAL SYSTEM 4.9 AUXILIARYELECTRICAL SYSTEiM

4. The 250-Volt Shutdown Board 3EB battery, all three unit batteries, a

battery charger for each

,battery, and associated battery boards are oper-able.

5. Accident signal logic system is operable.

6. There shall be,a minimum of 103, 300 gallons of diesel fuel in the unit 3 standby diesel generator fuel tanks.

c. The loss of voltage and degraded voltage relays which start the diesel, generators from the 4-kV shutdown boards, shall be, calibrated annually for trip and reset and the measurements logged.

These relays shall be calibrated as specified in table 4.9.A.4.c.

d. 4-kV shutdown board voltages shall be recorded once every 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

5. 480-V RMOV boards D and E

a.

Once per operating cycle, the automatic transfer feature for 480-V RMOV boards D and E shall be functionally tested to verify auto-transfer capability.

B. 0 eration with Ino erable

~Eui mene B. 0 eration with Ino erable

~Eui >mhn t Whenever the reactor is in Startup mode or Run mode and not in a cold condition, the availability of electric power shall be as specified in 3.9.A, except as specified herein.

l. From and after the date that only one offsite power source is available, re-actor operation is per-missible under this condi-tion for seven days.

l. When only one offsite power source is operable, all unit 3 diesel generators and associated boards must be demonstrated to be operable immediately and daily there-after.

321

4

LQ1ITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9 AUXILIARYELECTRICAL SYSTEM 4.9 AUXILIARYELECTRICAL SYSTEM 2.

When one unit 3 diesel generator (3A, 3B, 3C, or 3D) is inoperable, contin-ued reactor operation is

.permissible during the succeeding 7 days, provid-ed that two offsite power sources are available as specified in 3.9.A.l.c, and all of the CS, RHR (I.PCI and Containment Cool ing) Systems, an<I the re-maining three unit 3 diesel generators are operable.

If this requirement cannot be met, an orderly shutdo shall be initiated and the reactor shall be shutdown and in the cold condition within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

2.

When one unit 3 diesel gener-ator is found to be'noperable, all of the CS, RHR (LPCI and' Containment Cooling)

Systems and the remaining unit 3 diesel generators and associated boards shall be demonstrated to be operable immediately an<1 daily thereafter.

3.

From and after the date that the 4-kV bus tie board becomes inoperablc, reactor operation is per-missible indefinitely pro-vided one of the required offsite power sources is not supplied from the 161-kV system through the bus tie board.

3.

When a required offs'ower sources is unavailab because the 4-kV bus tie boa or a start bus is inopera

, all unit 3 diesel genera

.s and associated boards sh, 1 be

<lemonstr lte<1 oper lb1 llllmed 1 ately and daily ther l ter.

The remaining offsit source and associated busse shall be checked to be energized daily.

322

I

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LIMITINC CONl)ITIONS FOR OPERATION SURVEILLANCE RE(iUIREMENTS 3.9 AUXILIARYELECTRICAL SYSTEM 4.9 AUXILIARYELECTRICAL SYSTEM 4.

When one unit 3 4-kV shut-down board is inoperable, continued reactor opera-tion is permissible for a period of 5 days, provided that two offsite power sources nre <<vailable, as specified in 3.9.A.l.c and the remaining unit 3 4-kV shutdown boards and associ ated diesel generators, CS RHR (LPCI and Containment Cooling) Systems, and all unit 3 480-V emergency power boards are operable.

If this requirement cannot be met, an orderly shut-~

down shall be initiated and the reactor shall be shutdown and in the cold condition within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

4.

When one unit 3 4-kV shutdown board is found to be inoper-able, all remaining unit 3 4-kV shutdown boards and associated diesel generators, CS and RHR (LPCI and C>>ntain-ment Co>>ling) Systems supplied by the remaining 4-kV shutdown boards shall be demonstrated to be operable, immediately and daily thereafter.

5.

From and af ter the date that one of the 480 volt diesel Aux. boards becomes inoperable, reactor opera-tion is permissible for a period of 5 days.

5.

When one 480 Volt diesel aux-iliary board is found inoper-

able, the remaining, diesel auxiliary board and each unit 3 diesel shall be verified operable immediately and daily thereafter.

323

(

~

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LLMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9 AUXILIARYELECTRICAL SYSTEM 4.9 AUXILIARYELECTRICAL SYSTEM 6.

From and after the date that the 250-Volt Shutdown board 3EB battery or one of the three 250-Volt unit

.batteries and/or its associated battery board is found to be inoperable for any reason, continued reactor operation is per-missible during the succeeding seven days.

Except for routine surveil lance testing, the NRC shall be notified within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months of the situation, the precautions to be taken during this period~

and the plans to return the failed component to an operable state.

7.

When one division of the Logic System is inoperable, continued reactor operatio is permissible under this condition for seven

days, provided the CSCS require-ments Listed ln Specifica-tion 3.9.B.2 are satisfied The NRC shall be notified within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months of the sit-

uation, the precautions to be taken during this period and the plans to return the failed component to an operable state.

324

~

5

~

LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9 AUXILIARY ELECTRICAL SYSTEM 4.9 AUXILIARYELECTRICAL SYSTEM

8. (deleted)

9. The following limiting conditions for operation

.exists for the under-voltage relays which start the diesel generators on the 4-kV shutdown boards.

a.

The loss of voltage re-lay channel which start the diesel generator fo a complete loss of voltage on a 4-kV shut-down board may be inop-erable for 10 days pro-vided the degraded vol-tage relay channel on that shutdown board is operable (wi,thin the surveillance schedule of 4.9.A.4.b).

b. The degraded voltage re lay channel which start the diesel generator fo degraded voltage on a 4-kV shutdown board may be inoperable for 10 days provided the loss of voltage relay channel on that shutdown board is operable (within the surveillance schedule of 4.9.A.4.b).

c.

One of the three phase-to-phase degraded vol-tage relays provided to detect a degraded vol-tage on a 4-kV shutdown board may be inoperable for 15 days provided both of the following conditions are satis-fied.

325

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~

LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREMENTS 3.9 AUXILIARY ELECTRICAL SYSTEM 4.9 AUXILIARYELECTRICAL SYSTFH 1.

The other two phase-to-phase degraded voltage relays on that 4-kV shutdown board are operable (within the surveil-lance schedule of 4.9.A.4.b).

2. The loss of voltage relay channel on that shutdown board is operable (within the surveillance schedule of 4.9.A.4.b).

d. The degraded voltage relay channel and the loss of voltage relay channel on a 4-kV shut-down board may be inop-erable for 5 days pro-vided the other shut-down boards and under-voltage relays are operable.

(Within the surveillance schedule of 4.9.A.4.b).

10.

When one 480 volt shutdown board is found to be inop-

erable, the reactor will be placed in hot standby within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and cold shutdown w'ithin 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

11. If one 480-V RHOV board HG set is inoperable,

the, reactor may remain in oper ation for a period not to exceed seven days, provide the remaining 480-V RHOV board HG sets and their associated loads remain operable.

325a

C'

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y LIMITING CONDITIONS FOR OPERATION SURVEILLANCE RE(fUIREHENTS 3.9 AUXILIARYELECTRICAL SYSTEM 4.9 AUXILIARYFLECTRICAL SYSTFM

12. If any two 480-V RMOV board MG sets become inop-

erable, the reactor shall be placed in the cold shut adown condition within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months '3.

If the requirements for operating in the condi-tions specified by 3.9.B.l through 3.9.B.12 cannot be

met, an orderly shutdown sha13 be initiated and the rencto<

si<;<11 be:;l<<<tdow<<

and in the cold condition within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

C. 0 eration in Cold Shutdown Condition Whenever the reactor is in the cold shutdown condition with irradiated fuel in the

reactor, the availability of electric power shall be as specified in Section 3.9.A except as specified herein.

1. At least two unit 3 diesel gener<<tora

<u<d tl<olr

<<ss<><<.i:<town boards shall be operable.

2.

An additional source of power energized and cap-able of supplying power to the unit 3 shutdown boards consisting of at least one of the following:

a.

One of the offsite power sources specified in 3.9.A.l.c.

b.

A third operable diesel generator.

325b

~

LI.Ml.T[.NO CONDITIONS l'OR OPERATION SURVEiLLANCE RlÃ)UlREHENTS 3.9 AUXILIARYELECTRICAL SYSTEM 4.9 AUXILIARYELECTRICAL SYSTEM

3. At least one unit 3 480-V shutdown board must be operable.

4.

One 480-V RMOV board motor generator (MG) set is required for each RMOV board (D or E) required to support operation of the RHR system in accordance with 3.5.B.9.

326

Table 4.9.A.4.c Rela Location l.

4-KV Shutdown Boards Trip Setpoint:

0 volts with a 1.5-second time delay VOLTACE RELAY SETPOIKTS/DIESEL CENERATOR START Tri Level Settin Remarks Start diesel generators on loss oi offsite po'er.

Allowable Values:

Trip Range:

Reset Setpoint:

Allowable Values:

Reset Range:

+.1 second 1.4 to 1.6 seconds 2870-V

+

2% of 2870-V 2813-V to 2927-V Undervolta e

2.

4-kV Shutdown Boards Trip Setpoint:

3920 Allowable Values:

3900-3940 Second level unde".voltage sensing relays start diesel generator on degraded voltage.

Reset Setpoint:

Reset at < 1.5% above trip value 3.

4;kU Shutdown Boards (Timers shown for 4-kV shutdown board 3EA.

4-kV shutdown boards 3EB

3EC, and 3ED, similar, except for change of suffix)

Timer 2-211-lA 2-211-2A 2-211-3A 2-211-4A Setpoint (seconds) 0.3

+ 10%

4.0

+

10%

6.9

+ 10%

1.3 10%

Critical Time (sec nds)

.':/A S.2 Auxiliary timers.or seco..d level undervoltage sensin" relays.

The setpoint ranges spec'=ied assure that the o".crating times will be bul w the criti-cal t imes speci. i~-'.

These ran es are base'n timer

.ropeatability

~ f - 5",'s specified by the:"..anu a-turer.

(

The objective of this specification is to assure an adequate source of electrical power to operate facilities to cool the unit during shutdown and to operate the engineered safeguards following an accident.

There are three sources of alternating current electrical energy available,

namely, the 161-kV transmission

system, the 500-kV transmission

system, and the diesel generators.

The generator breaker and a unit station service transformer for unit 3 provide a non-interruptible source of offsite power from the 500-kV transmission system to the unit 3 shutdown boards.

Auxiliary power can also be supplied from the 161-kV transmission system through the common station service transformers or through the cooling tower trans-formers by way of the bus tie board.

The 4-kV bus tie board may remain out of service indefinitely provided one of the required offsite power sources is not supplied from the 161-kU system through the bus tie board.

The minimum fuel oil requirement of 103, 300 gallons is sufficient for 7 days of full load operation of 3 diesels and is conservatively based on availability of a replenishment supply.

The degraded voltage sensing relays provide a start signal to the diesel generators in the event that a deteriorated voltage condition exists on a 4-kV shutdown board.

This starting signal is independent of the starting signal generated by the complete loss of voltage relays and will continue to function and start the diesel generators on complete loss of voltage should the loss of voltage relays become inoperable.

The 15-day inoperable time limit specified when one of the three phase-to-phase degraded voltage relays is inoperable is justified based on the two out of three permissive logic scheme pro-vided with these relays.

A 4-kV shutdown board is allowed to bc o<<t of operation for n brief ieriod to <<I..I>>w for im>i>>ti>>nncu:>>ul tosti>>ppA)vttli>>I! >>I I I omni>>i>>g 4-kV shutdown boards and associated diesel generators CS,

RIIR, (I.PCI and Containment Cooling) Systems supplied by the remaining 4-kV shut-down boards, and all emergency 480V power boards are operable.

The 480V diesel Aux, board may be out of service for short periods for tests and maintenance.

327

There are five 250-Volt d-c battery systems associated with unit 3, each of which consists of a battery, battery charger, and distribu-tion equipment.

Three of these systems provide power for unit control functions, operative power for unit motor loads, and alternative drive power for a 115-volt a-c unit perferre<1 motor-generator set.

One 250-Volt d-c system provides power for common plant and transmission system control functions, drive power for a 115-Volt a-c plant preferred motor-generator set, and emergency drive power for certain unit large motor loads.

The fifth battery system delivers control power tn a 4-kV shut--

down board.

The 250-Volt d-c system is so arranged, and the batteries sized

such, that the loss of any one unit battery will not prevent the safe shutdown and cooldown of all three units in the event of the loss of offsite power and a design basis accident in any one unit.

Loss of control power to any engineered safeguard control circuit is annunciated in the main control room of the unit affected.'he station 'battery supplies loads that are not essential for safe shutdown and cooldown of the nuclear system.

This battery was not considered in the accident load calculations.

There are two 480-V ac Reactor Motor-Operated Valve (RMOV) Boards that contain motor-generator (M-G) sets in their feeder lines.

These 480-V ac RMOV boards have an automatic transfer from their normal to alternate power source (480-V ac shutdown boards).

The M-G sets act as electrical isolators to prevent a fault from propa-gating between electrical divisions due to an automatic transfer.

The 480-U ac RMOV boards involved provide motive power to valves associated with the LPCI mode of the RHR system.

Having an M-G set out of service reduces the assurance that full RHR (I.PCI) capacity will be availal>le when required.

Since suff icient u<)uip-m nt is available to maintain the minimum complement required for RHR (I.PCI) operation',

a 7-day servicing period is justified.,

Having two M-G sets out of service can considerably reduce equipment availability.

Therefore, the affected unit shall be placed in cold shutdown within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

328

3.

250-volt D.C. Power Supply and Distribution (BFNP FSAR subsection 8.6) 4.

Memorandum from T. G. Campbell to G. T. Jones concerning capacity of 161-kV transmission lines dated October 28, 1981 (L23 811014 929) 330

ENCLOSURE 2

DES CRIPTION OF PROPOSED PERMANENT ARRANGEMENT OF UNDERVOLTAOE CORRECTIVE MODIFICATIONS FOR BROGANS FERRY NUCLEAR PLANT UNIT 3

TABLE OF CO TENTS 8.1.1 8.1.2 Utility Grid and Interconnections Plant Electricai Power Systems 8 ~ 2 OFFS ITE POWER SYSTEM 8.2.1 Description of Utility Grid and Preferred Power 8.2.2 Analysis 8.2-1 8.2-2 8. 3 NORMAL 8.3.1 8.3.2 8.3.9 8.9.4 8.9.5 8.3.6 8.3.7 AUXILIARY POWER SYSTEM General Power Generation Objective Po~er Generation Design Basis Safety Design Basis Description Safety Evaluation Inspection and Testing 8.9-1 8.3-1 8.3-2 8.3-3

8. 9-3 8.3-7

8. 3-10 8.4 120-VOLT AC POWER SUPPLY AND DISTRIBUTION 8.4.1 8.4.2 8.4.3 8.4.4 Power Genera t i on Obj e c t iv e Power Genera tion Des ign Basis Description Inspection and Testing 8.4.1 8.4.1 8.4.1 8.4.2

ll

LIST OF TABLES Auxiliary Power Suppl ie s and Bus Transfer Schemes

Cl

LIST OF FIG RES TVA Transmission System Extra High Voltage Expansion Plan Typical Normal Conditions Loads on USSTs LOCA Unit 3, Trip Units 1

and 2

Loads on USSTs, LOCA Unit 1, Trip Units 2

8 3

Loads on USSTs, Shutdown Bus No.

2 Out of Service LOCA Unit 3, Trip Units 1

and 2

S tep up Trans former No.

3 Trips Loads of Units 1

and 2

on USSTs, Loads of Unit 3

on CSSTs LOCA Unit 3, Trip Units 1

8 2

CSST A Out of Service, Step up Transformer No.

3 Trips, Loads of Unit 3

on CSST B

Browns Perry 20.7-kV Unit 1

Bus Voltage and Frequency - Loss of One Cumberland Unit Loads on USSTs Browns Ferry 161-kV Bus Vol tage and Frequency Loss of One Cumberland Unit - Loads on USSTs Browns Ferry 20.7-kV Unit 2

Bus'ol tage and Frequency Loss of Browns Ferry Unit 2

Loads on USSTs Browns Perry 161-kV Bus Voltage.

and Frequency Loss of Browns Ferry Unit 2

Loads on USSTs

LI T OF PXG RES (cont.)

Browns Ferry 20.7-kV Unit 1

Bus Voltage and Frequency Loss of Three Browns Perry Units Steady State Loads on USSTs Browns Perry 161-kV Bus Voltage and Prequency Loss of Three Browns Perry Units Steady State Loads on USSTs Browns Ferry 20.7-kV Uni t 1

Bus Vol tage and Frequency Throe Phase Faul t on Unit 2

Terminals - Faul t Cleared by Generator Breaker Loads on USSTs Browns Ferry 20.7-kV Unit 2

Bus Voltage and Frequency - Three Phase Fault on Unit 2

Terminals Fault Cleared by Generator Breaker Loads on USSTs Browns Ferry 161-kV Bus Voltage and Frequency Three Pha se Paul t on Unit 2 Terminal s Pault Cleared by Generator Breaker Loads on USSTs Browns Ferry 161-kV Bus Vol ta ge and Frequency Three Phase Fault on Unit 2 Terminals Steady State Loads for Unit 2

Transferred to CSSTs Key Diagram of Normal Auxiliary Power System Units 1

and 2

iv

LIST OF FIG RES (cont.)

T~J e Key Diagram o f Standby Auxi 1 iary Power System - Units 1

and 2

Key Diagram of Normal and Standby Auziliary Power System Unit 3

Plant DC and Instrument and Control AC Systems One Line Diagram Instrument and Control AC System One Line Diagram

BFNP 8.1.1 U

The Tennessee Valley Authority (TVA) is a corporate agency of the United States Government serving the State of Tennessee and parts of siz other states in the southeast on the boundaries of Tennessee.

TVA is interconnected with electric power companies to the north~ west,

south, and east of its service area.

As shown in Figure 8 gal-1, the TVA Extra High Voltage system consists of interconnected generating plants and intertie transformer banks connecting the 500-and 161-kV transmission systems.

The TVA grid consists of hydro plants, fossil fueled

plants, combustion turbine plants, and nuclear plants supplying electric energy over a transmission system consisting of voltages up through 500-kV.

The Browns Ferry Nuclear Plant is located in Limestone

County, Alabama, at river mile 294 on the Tennessee River approz imate Iy 9

miles southwest of Athens,

Alabama, and 9 miles northwest of

Decatur, Alabama (See Figure 8.1.1-1).

The plant is connected into an ezisting transmission grid supplying large load centers.

Each of the nuolear units is connected into TVA's 500-kV txansmission system.

The seven 500-kV transmission connections consist of two lines to the Madison 500-kV Substation, two lines to the Trinity 500-kV Substation, one line to the 1'fest Point 500-kV Substation, and one line to the Davidson 500-kV Substation, and one line to the Cordova 500-kV Substation.

The 161-kV switchyard is connected into the-161-kV transmission system through one line to the Trinity 500-161-kV Substation and one line to the Athens,

Alabama, 161-kV Substation.

The 161-kV system and the 500-kV system via step-up transformers, employing fully rated breakers to disconnect the main generators, Ferry Nuclear Plant with sources of offsite meet the requirements of GDC-17.

C 8.1.2 P

E a

P w

S the main generator generator circuit provide the Browns electrical power to Under nomal operating conditions unit 3 is supplied electric power from its associated main generator via the unit station service transformers.

During normal startup and shutdown the unit's main generator is isolated by a generator

breaker, and electric power is supplied to the unit auzil iary power system from the 500-kV offsite grid via the main transformers.

If electric power fx'om the 500-kV gxid is unavailable power is thon supplied fxom two 161-kV transmission lines via two common station service transformers.

In addition, two cooling towex transformers provide a backup source of power for unit 3

shutdown 8.1-1

BFNP loads via the bus tie board (Figure 8.3-2)

~

The standby source of auxiliary power is from foux diesel generator units.

These units start automatically on loss of voltage or a degraded voltage, on the associated shutdown board from sol f-contained a i x star ting systems.

In the long tex'm following an accident>

unit 3 diesel genoxators will be pax'alleled with their units 1

and 2 counterparts (Ref erence:

FSAR Soction 8.5.4.1).

250-V B

S There are five 250-volt d-c battery systems associated with unit 3

each of which consists of a battery, battery charger, and distribution equipment.

Thxee of these systems provide power for unit control functions, operative power for unit motor loads, and alternative drive power for a 115-volt a-c unit prefexred motor-drivon-genorator set and control power to three of the 4160-V shutdown boards.

One 250-volt d-c system pxovides power for oommon plant and transmission system control functions, drive power for a 115-volt a-c plant preferred motor-generator

set, and emergency drive power for certain large motox loads, (e'.g.,

lube oil pump)

~

The fifth remaining system delivers control power to the fourth 4160-volt shutdown boax'd.

48-V B

S m

Thoro are three 48-vol t d-c battery systems each of which oonsists of a battery, battery charger, and distx'ibution panel.

Two of these systems provide power to the two annunciator systems and the third is the power source fox the plant telephone system.

U P

The 115-volt a-c unit proferred system is supplied by an a'ssociated motor-genexator set which is normally driven by a low.

slip induction motor supplied fxom a 480-V shutdown bus.

An altornate 250-volt d-c drive motor is provided on the common shaf t to provide a continous 115-vol t a-c powor source throughout an automatic transfer from tho a-c drive motox to the d-c drive motox' 115-V l Po B

s Thoro are two 115-volt a-c instrument and oontrol power buses for unit 3.

Hach of the instrument and oontxol powex'uses is supplied by its associated 480- 208/120-volt transformers which in turn are oach supplied from independent 480-V shutdown buses.

This provides an independent 115-volt a-c control powex bus for 8.1-2

BPNP each of the redundant instrument and control channels for each unit.

115-P n

P S

e A 215 volt a-c plant preferred system is supplied by a motor-geperator set with a 250-volt d-c drive motor that is started u

on loss of normal plant a-c power.

This system supplies the up n

plant chart drives,

clocks, and certain communication equipment.

TVA BOO-KV TRANS~ISSIQ

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RLR HISS GENERATING UNI I'UTURE GENERATING UNIT SUBSTATION (BUS)

FUTURE SUBSTATION (BUS)

- TRANSHISSION LINK

- FUTURE TRANSHISSION LINE INTERCOWNECTIOtt (LINKS TVA Hl TH OTHER UTILITIES)

< CULLHAN(93)

I'- (00)

I GA ALA PHR PN(t

~ NESHOBA(89)

'- (91)

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HISS PAL FIGURE 8.1.1-1 SULLI,<<tt(N NE JOHN CATT(98)

DANE P. BEND (9<))

VOLUNTEER ALCGA (9.8)

HATTS BAR.

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ATHENS t95f

<.(95)

Ip DUKE SEOUDTAH:

BFNP 8.2 OFFSITE POW R

SYSTEM 8.2.1 D

This Browns Parry Nuclear Plant generators are connected into an ozisting network. supplying large load centers.

The three goporating units are tied into TVA's 500-kV transmission system via seven 500-kV txansmission lines.

The 161-kV switchyard is supp e

y li d by two 161-kV transmission lines.

These sources have C-17.

the capacity and capability to moot the requirements of GD The 500-kV connections consist of two lines 37.42 and 40.26 miles long to the Madison 500-kU Substation, two lines 10.41 and 10.66 milos long to the Trinity 500-kV Substation, one line 104.57 miles long to tho Davidson 500-kV substation, one line 118.18 miles long to tho Wast Point 500-kV Substation, and one line 207 miles long to the Cordova 500-Kv Substation.

The 161-kV switohyard is supplied by two 161-kV transmission lines.

One of those lines is 10.94 miles long and connects to the Trinity 500-161-kV Substation, and the o ther is 14.33 miles long and connects to the Athens,

Alabama, 161-kV Substation.

The Athens Substation is, in turn, connected to the Ardmoro,

Alabama, 161-kV Substation which has direct connections to the Wheeler Hydro Plant and to the Winchestex 161-kV Substation.

The Trinity-Browns Ferry 161-kV Transmission Line shares a 2.09-mile river ox'ossing with tho Browns Ferry-Trinity No.

1 500-kV Transmission Line> crosses under all of the 500-kV transmission lines i

f the Browns Ferry 500 kV switchyard

buses, and is

-T i it No.

1 500-on a

common right of way with the Browns Ferry-Trinity No.

1 kV Transmission Line for F 31 miles.

Tho lines in these sections axo separated sufficiently to ensure h t th failure of any tower in one line will not endanger the A

integrity of the 500-kV or tho 161-kV transmission systems.

t f ilure at one transmission line crossing or in tho river one 161-kV crossing could remove from servioo two 500-kV and one circuits while a tower failure in several other areas could romove fxom service one 500-kV and one 161-kU circuit.

The Bxowns Ferry-Athons 161-kV Transmi.ssion Line crosses under the P i t 500-kV Transmission Line near the Browns Ferry Nuclear est o

n No.

1 Plant and continues parallel with tho Browns Ferry-Madison o.

500-kV Transmission Line for 0.96 mile and crosses under each end of this 0.96-mile section.

The Browns Fexry-Athens 161-kV Txansmission Line also crosses under the new Browns Ferry-Cordova 500-kV Transmission Line near the Browns Fex'x'y Nuclear Plant.

Tho lines in this section are separated sufficiently to ensure that the failure of any tower in one line could remove from service no more than one 500-kV and one 161-kV ci.rcuit.

BFNP TVA's transmission lines are designed to meet or exceed medium loading requirements of the National Electrical Safety Code.

On 161-kU lines, design cases provide for wind loadings of approximately 85 mph wind on bare conductors and vertical loading strength based on approximately 1-inch radial ice.

On 500-kV lin s

design cases provide for wind loadings of approximately h

10g-mph wind on bare conductors and vertical loading strengt b

ed on approximately 1-1/4-inch radial ice.

These loading ase n

de conditions assure strength to provide adequate reliability un er we'a ther conditions encountered on TVA's transmission system.

The wire tensions for the conductors were'elected to assure that vibration does not cause damage to the conductors.

Galloping of conductors can occur in the Browns Ferry area.

TVA's experience prior to one ocourrence of severe ice and wind conditions in

1980, has been that galloping has not been damaging (causing phase-to-phase faults) to the area 500-and 161-kV transmission lines.

There was one incident a

number of years ago on a 46-kV line which had relatively close phase spacing.

Transmission I ines in the 500 kV voltage class have two overhead ground wires provided for lightning protection.

This shielding has been effective for an area isokeraunic level of 60 and is reflected in the average opera ting record of only 0.8 flashover interruptions annually per 100 miles of line.

The operating record of the Trinity-Browns Ferry-Athens 161-kV Transmission Line is 14 operations in the last six years (1975-1980) because of lightning'he use of circuit breakers with automatic reclosing results in most lightning-caused interruptions being momentary.

One 250-volt d-o battery board is provided in the powerhouse to supply switchyard requirements.

Two 250-volt batteries are av'ailable

~

For loss of one battery, a manual transfer to the other battery is required.

Each transmission line is protected with primary and backup relaying systems and each power circuit breaker is equipped with two separate trip coils.

8.2.2

~A The seven transmission lines connected to the 500-kV switchyard and the two transmission lines connected to the 161-kV switchyard have sufficient capacity to supply the total required power to the plant's electrical auxiliary power system under

normal, shutdown, and loss of coolant accident (LOCA) conditions for any single transmission contingency.

Power reaches unit 3

auxiliary loads from the 500-kV system through its main transformer and its unit station service transformers (USSTs) and from the 161-kV system over two physically independent 161-kV transmission lines thxough the common station service 8.2<<2

BFNP transformers (CSSTs).

The 161-kV system, through two cooling towex'ransformers, provides a backup source of powex'or unit 3

shutdown loads via the bus tie board.

These sources have sufficient capacity to supply all loads regax'dless of plant conditions.

Separation of the lines, the protection

systems, and a strong transmission grid minimize the probability of simultaneous failures of offsi te power sources.

Steady-state studies show these offsite sources to be capable of supplying the onsite powex system when all nuclear units are simultaneously removed from service.

Transient stability studies included a three-phase fault on a

genexator terminal in which the unit was disconnected automatically from the transmission system as a result of the disturbanoe.

Other transient stability studies included loss of TVA's largest unit, loss of one Bxowns Ferry unit, and the simultaneous loss of three Browns Ferry units.

These tx ans ient stability cases were considered to be the most serious conditions of postulated transmission distuxbances.

They show that the transmission system remains stable with negligible disturbance to the offsite power sources.

Steady-state studies show that the 500-and 161-kV netwoxks are capable of supplying the offsite power requirements for normal,

shutdown, and LOCA conditions.

Due to the large number of diverse generating units and strong interconnections, the likelihood of an outage of a sufficient part of the transmission system causing the loss of all sources of offsite power is considered to be extremely x'emote.

In none of the steady-state ox transient stability oases were the offsite power sources incapacitated because of thermal overloads, voltage variations, oZ frequency deviations so as to decrease the reliability of the transmission system to supply power to the onsite power systems.

Figures 8.2.2-1 thxough 8.2.2-5 show the power flow around the Browns Ferry 500-and 161-kV buses for (1) typical peak system normal conditions>

(2)

LOCA unit 3, trip units 1

and 2, unit loads on USSTs, (3)

LOCA unit 1, trip units 2

and 3, unit loads on USSTs, shutdown bus No.

2 out of service, (4)

LOCA unit 3, trip units 1

and 2, generator No.

3 step-up transformer trips, unit 3 loads on CSSTs and units 1

and 2 loads on USSTs, and (5)

LOCA unit 3, trip units 1

and 2,

CSSTA out of service, generator No.

3 step-up transformer trips, unit 3 loads on CSSTB, units 1

and 2

on USSTs (initial Browns Ferxy 161-kV bus voltage raised to 166.3 kV for abnormal system operations with a

CSST out of sexv ice)

~

Figures 8.2.2-6a through 8.2.2-8b show vol tage and frequency at Bxowns Ferry for (6a) the 20.7-kV unit 1 bus for the loss of a

1300-MV genera tox at TVA' Cumberl and S team Pl ant, wh 3 ch i s one 8.2-3

BFNP of TVh's two largest generators, and (6b) the 161-kV bus for the loss of the Cumberland unit> (7a) the 20.7-kV uni,t 2 bus for the loss of Browns Ferry unit 2 with the loads served from the

USSTs, and (7b) the 161-kV bus for the same conditionj and (ga) the 20.7-kV unit bus for the loss of all three Browns Ferry units, and (gb) the 161-kV bus for the same condition.

Figures 8.2.2-9a through 8.2.2-10 show voltage and frequency <<ith a three phase fault on unit 2 terminals for (9a) the 20.7-kV unit 1 bus, (9b) the 20.7-kV unit 2 bus, (9c) the 161-kV bus, and (10) the 161kV bus with the steady state loads transferred to the CSSTs.

8.2-4

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IV 50 ln tl nl 163. 3 I.015 CSSTA CTTI CSSTB CTT2 BROWNS.FERRY FSAR FIGURE 8.2.2.2 fg LOCA UNIT S, TRIP UNITS I 4 2

LQFlDS QN USSTS

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163. 3 I 015 CSSTA CTTI CSSTB CTT2 BROGANS FERRY FSAR FXGURE 8.2.2 '

LOCA UNIT I, TRIP uNITS 2

e, 3 - LQADS QN USSTS SHUTDQHN BUS NQ.

2 QUT QF SERVICE

C'

t 514< 2 H V01NS liD',ID I

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1. 023 CSSTA CTTS CSS10 CTT2 BROMNS FERRY FSAR FIGURE 8.2.2.II LQCR UNIT 3, TRIP UNITS I

4 2 - STEP UP TFIFlNSF.

IT3 TRIPS LGADS GF I

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BROWNS FERRY FSAR FIGURE 8 ' ' '

r LOCR UNIT 3, TRIP UNITS I

4 2 CSSTR QUT QF SERVICE STEP UP TRANSF.

II3 TRIPS, LQRDS QF 3

QN CSSTB

~ ~ ~

bl Hz

1.15

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~ 95 H

.90 60 Hz

~ 85

.80 UOLTACE FREQUENCY

- o75

-0. l25 0.0

0. l250 0.3750 0.5250 0.2500 0~5000 TIHE - SECONDS 0.7500

0. 8750 59 Hz Steady l.0000 State Brogans Ferry Final Safety

. Analysis Report Browns Ferry 20.7-kV Unit l Bus Voltage And Frequency - Loss Of One Cumberland Unit Loads On USSTs Figurc 8.2.2-6a'

61 Hz

-li15

" -1.10 1.05 1,00 o

'.95 D>>

90 60 HK

.85

.80 VOLTAGE

~

FREQUENCY

+75

0. 1 25 0.0

0. l250

0. 3150 O.ez50 o.e>50 Steady 0.2500 o.5ono 0.7500 l.0030 Stotn TIME - SECOHDS 59 Hz Browns 'Ferry Final Sa fe ty Analysis Report Browns Ferry 161-kY Bus Voltage And Frequency - Loss Of One Cumberland Unit Loads On USSTs Figure 8.2.2-6b

61 Hz 1.15

1. 10 1.05 1,00 g

.95

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0. I?50 0.3750 Oeb250 0.0750 0.2500 0,5000 0'500 TIME - SECONDS Steady l.0000State 59 Hx BroMns Ferry Final Safety Analysis Report Brogans Ferry 20.7-kV Unit 2 Bus Voltage And Frequency - Loss Of Brob7ns Ferry Unit 2 Loads On USSTs Figure 8.2.2-7a

1 Hz le 15 1,10 1.05 lo00

.95 5

.90 60 Hr.

.85

.8 VOLTAGE FREQUENCY I7

0. I 25 0.0

0. 1250 0.3750 0.6250 0.0250 0.2500 o.5ono

0. 7500 TINE - SECOHDS 59 Hx Stea4y i.oooo Sror.e Browns Ferry Final Safety Analysis Report Browns Ferry 161-kV Bus Voltage And Frequency Loss Of Browns Ferry Unit 2 Loads On USSTs Figure 8.2.2-7b

61 Hz le 15 1 10 1.05 li00

.95 H5 04

~90 60 Hz

.85

.80 VOLTACE FREQUENCY

.75 0.)25 0.0 0.1250 0.2500

0. 3150

0. 6250 0.5000 TINE - SECONDS 0.7500

0. 0150 Steady

< ~ 0000stnzc 59 Hz Browns Ferry Final Safety Analysis Report Browns Ferry 20.7-kV Unit 1 Bus Voltage And Frequency Loss Of Three Brovns Ferry Units Steady State Loads For Units 1

& 2 On USSTs, Unit 3 On CTTs Figure 8.2.2-8a

C

61 NR

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.8 VOLTAGE FfKQUENCY 0.

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> ~ 0oo4 Stat"e TIME - SECONDS Browns Perry Final Safety Analysis Report Browns Perry 161-kV Bus Voltage And Frequency - Loss Of Three Browns Ferry Units - Steady State Loads For Units l & 2 On USSTs, Unit 3 On CTTs Figure 8.2.2-8b

61 Hz le 15 1.10 1.05

~ ~

1,00

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5,90 60 HK F85 ISO VOLTACE

.75

-0. I 25 0.0

0. I250 0.3150 O.e250 0.0750 Stonily Oo2500 0.5000 0.7500 I ~ 0000 S 0 State TINE - SECONDS 59 Hz Browns Ferry Final Safety Analysis Report Browns Ferry 20.7-kV Unit l Bus Voltage And Frequency - Three Phase Fault On Unit 2 Terminals - Fault Cleared By Generator Breaker Loads On USSTs Figure 8.'2.2-9a

1.10

~

1.05

~ ~ ~

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'.5000 TIHE SECONDS 0+8750 0.7500 1.0000 '0"y State 59 Bx Browns Perry Final Safety Analysis Report Browns Ferry 20.7-kV Unit 2 Bus Voltage hnd Frequency Three Phase Fault On UnCt 2 Terminals Fault Cleared By Generator Breaker - Loads On'USSTs Figure 8.2.2-9b

Cl

("

61 Bx 1.15 lo10 i+05

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0.6250 TQK - SECONDS

0. 8150

0. 1500 Steady State

59. Hx Brans"..j'erry Final Safety

'-<-:". -"Analysis Report

i~.s @s Browns Ferry 16l-kV Bus Voltage And Frequency - Three PtIase Fault On Unit 2 Terminals - F'Iult Cleared By Generator Breaker Loads On USSTs Figure 8.2.2-9c

61 Hz i+15

'o10 1.05 1.0 g

.9 5

.90 60 HK 85

.80 VOLTAGE FREQUENCY

~75

-0. I25 0.0 Oo 1 250

0. 3150 O.e250

0. 0150 Steady Oo2500 0.5000 0.7500 I 0000 State TIME SECOHDS 59 Hz Growns Perry Final Safety An~lysis Report Browns Ferry 161-kV Bus Voltage And Frequency Three Phase Fault On Unit 2 Terminals - Steady State Loads For Unit 2 Transferred To CSSTs Figurc 8.2.2-10

BFNP 8.3 Powe S

Un 9

8.3.1

~G

'he plant electric powex system consists of the main generators, the main step-up transformers, the unit station service transformers (USSTs)i t'e common station service transformers (CSSTs),

the cooling tower transformers (CTTS),

the diesel generator

units, the batteries, and the eleotric distribution system as shown on Figures 8.9-1a 8 b and 8.3-2.

Under normal plant operating conditions the main generator supplies electrical power through isolated-phase buses to the main step-up transformers and the unit station service transformers which are physically located adjacent to the Turbine Building.

The primaries of the unit station serv ice transformers are connected to the isolated-phase bus at a point between the load side generator breaker terminals and the low-voltage connection of the main transformers.

The generator breaker has an interrupting capacity of 165,000 amperes at rated maximum voltage, a

continuous current rating of 36,000 amperes with a 4.8 cycle interrupting time, and a rated voltage of 24KV(RMS).

The maximum fault the breaker could be required to interrupt is 145,000 a@pores.

During normal operation station auxiliary power is taken from the main generator through the unit station service transformers.

During startup and

shutdown, auxiliary power is supplied from the 500-kV system through the main transformers with the main generators isolated by the main generator breakers.

Auxiliary power is also available through the two common station service transformers which are fed from the 161-kV system.

The cooling tower transformers provide a backup source of power for the unit 3 shutdown boards via the bus tie boards.

Standby (onsite) power for unit 3 is supplied by four diesel generator units.

In the event of a main generator trip during normal operation the generator breaker opens and auxiliary power is supplied from the 500-kV system through the main transformers.

Failure of the preferred offsite circuit from the 500-kV switchyard to tho main power transformer brings about an automatic transfer of the 4-kV unit boards with their connected shutdown boards to the CSSTs.

Should this supply bo unavailable or subsequently fail, only the safety-related buses (Class IE system) are automatically transferred to the CTTS.

If this supply is unavailable (or subsequently fails) the s'afoty-related buses are automatically transferred to the standby (onsite) electric power sources, 8.9.2 G

0 Tho basic funotion of tho normal auxiliary oleotrical power 8.3-1

0 BFNP system is to provide power for plant auxiliaries during startup, opera tion, and

shutdown, and to provide highly reliable power sources for plant loads which are important to its safety.

The normal aux iliax'y power system is to furni sh power to s tar tup and operate all the station auxiliary loads necessary for plant operation, and to furnish normal and alternate sources of power f~ safe shutdown.

The emergency sources of power for safe shutdown will be provided by the diesel generator units in the standby auxiliary power system.

8.3.3 P

0 D

B 1.

The normal auxiliary power system shall be designed to furnish adequate sources and distribution of power to station auxiliaries required for the normal unit power-producing

function, and to support plant operation in a

safe and efficient manner.

Station common functions are supplied from the CSSTs.

2.

Redundant off-site power sources, and on-site standby sources shall be available to serve these loads.

3.

These sources and systems shall be designed to furnish suffioient power to obtain prompt and safe shutdown of the

units, and to maintain the station in a safe condition.

4.

The system shall have a high degree of reliability.

8.3.4 S

D B

The normal auxiliary power system shall be designed to provide sufficient normal and alternate sources of power to assure a capability for prompt shutdown and continued maintenance of the plant in a

safe condition.

2; The normal and standby auxil iary sources shall be suf ficient in number and of such electrical and physical independence that no single avant>

as a minimum requirement>

can negate all auxiliary power at one time.

3.

The capacity of these sources when degraded to a fraction of their normal capacity shall be sufficient to supply the power required to shutdown the plant and maintain it in a safe condition under normal or accident situations.

4.

The buses shall be arranged so that essential loads can be easily transferred to the standby diesel generators.

5.

Buses and service components shall be physically separated to limit or localize the consequences of electrioal faults or 8.3-2

BFNP mechanical accidents oocurring at any point in the system.

Reference is made to Figuxes 8.3-la and 8.3-2, Key Diagrams of Normal Auxiliary Power

System, whi.ch shows the axrangement, source connections, and source ratings for this system.

Further.

reference is made to Figure 8.9-1b and 8.9-2, Key Diagrams of the Standby Auzlliaxy Power

System, which show the sources int'o the standby emergoncy auxiliary power system.

Table 8.3-1 is provided to ezplain the flow of power, txansfers between normal and alternate

sources, and pertinent operational comments on each of the boards and buses involved in tho normal and standby auxiliary power systems.

8.3.5.1 U

Co S

n C

Tow Tho unit station sorvice transformers axe located outside the turbine building near their respective main generator leads with isolated phase bus ducts used for the primary connections.

The common station service and cooling tower txansformers are located outside the building.

One lightning arrestex per phase, mounted directly on the transf ormer, is provided for each common station service transformer se condary.

The trans formers are three-phase

> double-secondary, outdoox'ype, oil fillod, class OA/FA and OA/FA/FOA, rated for 55 C temperature rise but with 65'C rise insulation.

The transformers are

designed, manufactured, and testod in accordance with TVA standard specif ication 54.080.

Transformox secondaxies are wye-connocted with resistance-grounded neutrals to provide positive rel ay opex'ation on ground faul ts, 1 imit shor t c ixcui t damage, and to avoid damaging transient overvol tage dux'ing faul t condi tions.

Common station service and cooling tower transformers are wye-oonnected on the 161-kV primary, and each has a delta-connected stab iliz ing w ind ing.

Unit st a tion serv ico trans formex's have delta-connectod 20.7-kV primary.

Each is capable of operating continuously with no loss of 1 ife at 112% of rat ing at 65-C temperature rise.

Unit station service transformer 9B, which provides the normal supply of power for operational loads on 4160V 9A and 3B unit boards and the safety-related buses from the main generator or 500-kV grid, i.s equipped with on-load tap changers on the primary winding that can regulate the voltage over a

+ 10-percent range.

Load tap changers operate from signals received from voltage sensors on either of the 4160V transformer secondary windings

~

Upon receiving a voltage signal outside the limits of a set bandwidth adjustable between 105-to 135 volts (on the 8.3-3

BFNP secondary of a 4160-volt to 120-volt potential transformer) the vol tage sensors transmit a signal to the load tap changers to compensate for the voltage chango.

The on-load tap, changers on the unit station service transformers have a voltage range from 18630 volts to 22770 volts with the equivalent of 17 possible tranfoxmation ratios.

The time re uired to change a tap position after receiving a signal from the voltage sensors is 4.0 seconds.

Remote manual control of the load tap changers can also be accomplished from the Main Control Room.

The on-load tap changers control circuits will block. tap ohanger operation and alarm for sensed voltage outside the permissible range fox tap changer operation.

Alarms are also prov xovided for tap changer off position and loss of control vol tage.

Both common station service transformers in service are capable 0

co f continuously oarrying the load consisting of the station common auxiliaries, plus all auxiliaries of two generating uni sts in the shutdown mode.

Th nit station service transformers 3A and 3B are capable of e

un of continuously carrying the load consisting of all auxiliaries o

the generating unit operating at full load plus the generating unit accident

loads,

~

8.3

~ $.2 160-U S

m I

The 4160-volt unit board switchgear consists of three buses as" shown in Figure 8.3-2.

The sections are connected to the station service transformers so that at least two sources of supply are available to eaoh section.

The sw itchgear se otions are heavy duty, metal clad, of standardized un o

na nit oonatruction.

Circuit breakers are of the air-magnetic type.

Power connections from the station service transformer oto the switchgear are with nonsegregated buses.

The Y-winding of the A USST supplys power to the recirculation pump boards.

Th unit and common station servioe transformers, oooling tower e

un a

d transformers, and cooling tower switchgear are located outsi e

the powerhouse.

All ovexcurxent relays and devices are selected to provide full selective coordination on overloads, ground

faults, and phase-to-phase faults throughout the system from station service transf ormers thxough motor control c'enter branch circuit molded-oase

breakers, All control power for switchgear is suppl ied from 250-V bat tories.

Each switchgear bus section and the startup buses have their source breakers interlocked to prevent paralleling power sources, and are provided with manual and automatic bus transfer schemes.

8.3-4

BFNP Automatic transfers are initiated by generator and transformex protective relays, degx'aded voltage or loss of voltage at the normal

supply, ox by accidental tripping of the normal supply breaker.-

Transfer is blocked through manually-reset lockout relays in case of a faulted bus.

Bach bus section is provided with a manual-automatic transfer selector switch.

All breakers and transformers are rated according to standard electrical industxy practice where the impedance of the

source, the short circuit current, and the breaker short circuit current capabilities are taken into account.

Equipment is designed and tested in accordance with NEHA and USA Standards for metal-clad switchgear and power circuit breakers.

Each circuit breakex is provided with 250-volt d-c stored-energy meohanisms mechanism'-operated, cell-mounted auxiliary switch with suffioient contacts for all required interlocking,'urrent transformers for metering and relaying; and necessary switchgear-type auxiliary relays for interlocking station auxiliaries and supervision.

Q Each switchgoax'us section and incoming line is provided with two open-delta-connected potential transformers.

Each motor breaker and 4160-480-V transformer primaxy breaker is provided with two current transformers (one in phase A and one in phase C) fox metering and phase overoux'rent relaying and one ground sensor

'current txansformer for ground xelaying.

Each includes induction-type overcurrent relays and an instantaneous ground overcurrent relay.

Each switchgear bus section has an induction-typo undervoltage relay which will trip all motors on the bus in oase of prolonged undervoltage.

Primary reading> daily logging>

two-element watt-hour meters are pr'ovided on each common station service transformer secondary

breaker, each tap from the start

buses, and for each motor br,eaker.

Each transformer secondary

breaker, and each start bus tap breaker is provided with three

ammeters, one wattmeter, and one voltmeter with -a transfer switoh.

One ammeter and 'transfer switch is provided on each motox'nd 4160-480-7 transformer feeders One voltmetex and transfer switch is provided on each switchboaxd bus section.

Metal-enclosed, group-phase, insulated-conductor bus ducts are provided from, common and unit station service transformer secondaxies to the start buses or switchgear, for start

buses, 8.3-5

and connections from the start buses to switchgear.

Bus ducts are furnished with a oontinuous ourrent rating as required for the full transformer or load rating.

Each switchgear bus and startup bus section is provided with a

three-phase set of differential relays of the high-speed induction overourrent type.

Each source and load breaker in each differential zone has three current transformers fox'his use only.

Each common, unit station serv ice.

and cooling tower transformer has differential overcurrent protection.

Bach secondary breakor is provided with three current transformers for differential relaying only.

Bach main and bus.tie breaker is provided with three current transformers in addition to those for differential relaying, for-use with metering and overcurrent relaying.

Three induction-type overourrent relays are provided, two for phase currents and one for residual or ground currents.

8.AS.9 480-L C

U S

b Each substation consists of 4160-480-V transformers, primary terminal box, and close-coupled or bus duct connected 480-V, metal-enclosed switchgear.

Eaoh substation bus is normally fed from its own transformers with an alternate source consisting eithex of an adjacent 480-V bus section ox of another transformer serv ing as standby.

Substations serving station lighting have manually operated main breakers.

All other substations have electrically operated main breakers.

With the exception of the 480-V shutdown board, all other substations have automatic bus transfer schemes.

Askarel-insulated transformers are connected to the switchgear so that the transformer can be enclosed with a curb to contain the Askarol in case of'a tank rupture.

Transformers are liquid filled, askarel insulated, three-phase, delta-delta, 60-kV BIL, rated for 55-C temperature rise but with 65 C rise insulation for 12% margin in continuous capability.

Transformers are class OA/fut FA except where dual ratings are shown in Figures 8.3-1a, 8.9-lb, and 8.3<<2, in which cases transformers are class OA/FA.

A no-load tap changer

handle, with means for padlocking.

is provided outside the tank.

Main and bus tie breakers and the main switchgear bus are rated 1600 or 600 amperes, depending on the maximum transformer capability>

and in accordance with USA Standard C37.16.

8.3-6

BFNP Each circuit breaker has three poles, and is electrically and mechanically trip free with either long time and instantaneous'r long time and short time overourrent trip devices unless ov'orcurrent relays are provided.

The circuit breakers have manual or electrical stored-energy closing mechanism, mechanical pushbutton trip> position indicator>

and are equipped for mounting on the drawout mechanism in tho breaker compartment.

Breakers controlling motors are electrically opoxated with time and instantaneous series overcurrent tripping.

Breakers serving motor control centers or panelboards are manually operated with short time selective and long time series overcurrent tripping.

480-V lighting switchgear have main breakers with short time seleotive and long time series overcurrent

tripping, and have key interlocking between main breakers.

All other 480 V switchgear havo main and bus tie breakers each provided with thxeo current transformers, three induction-type ov'ex cuxront relays with hand-reset lockout relay>

and circuit bxeaker control switoh.

Bach incoming line has two potential transformers, ammeter and switoh, voltmotor and switch, wattmeter, undervoltage, and overvol tage relay and auxiliary relay for initiating automatic bus transfer and automatioally rostoring normal condition.

Each t

-breaker or three-breaker bus transfer scheme has a manual-wo roa e

ch automatic transfer selector switch.

Each bus section whic serves important unit auxiliaxy motors has two delta-connected potential transformers with voltmeter and switch, and induction-t po undervoltage relay and auxiliary xelay to txip large motors ypo after prolonged loss of voltage.

Ea'ch 480-V main bus section has a

ground indicatox.

Bach electrically<<operated breaker has a test pushbutton for electrically closing and tx'ipping tho breaker only when 'the breakor is in the test positi,on.

8.9.5.4 480-V M

C C

n Motor control oenters axe in accordance with NEMA Standard IC1.

Cirouit equipmont consists of molded-case, thermal-magnetic circuit breakers, contactoxs or starters, and auxiliary relays ind timing relays as required.

Eaoh starter has one red indicating light, rated 550-V for 8.3-7

BFNP extended lamp Iife, connected aoross the load terminals to indicate that the contactor is energized.

Each singlo-speed motor starter has two hand reset overload re'lays.

Each two-speed motor starter has two overload xel ays fox each speed.

~

'tarters and contaotoxs are oontrollad with 120-volt a-c, single-

phase, ungroundod supplies.

Two-pole, 250-V control fuses are provided at each starter or contactor.

8

~ 9

~ 6 S

E Components used in the normal auxiliary power system are those whioh ara widely applied for utility and industrial appl ications.

In such applications, tha usage frequently demands reliability oomparabla to that of the requirements under consideration herein.

More specifically>

some examples of the oomponents whioh are used are General Electric type IAV relays for the detection of bus undervoltage, General Electric type

HFA, HGA, and HEA auxiliary relays fox necessary multiplication of contacts to,achieve simultaneous f'unctions, General Electric typo CR2820 motor-driven timing relays and General Electric type SB-1 or SBM contxol switches.

These electrical devioas are of the heavy duty type, conservatively r

a at d

and applied, with many years of operating experience.

Control power is from the 250-V battery system or from 480-1 20-volt a-c control power transformers.

Tho oontrol circuitry is designed to pxovido certain automatic features as described herein and to allow tho operators to take other appropriate action as may be required by the circumstances.

The occurrence of automatic functions is ad'equately displayed in the contxol room so that the operators can o ser n observe that proper conditions have been established.

For d

instance, should one of the 4.16-kV buses fail to be energize sf~ter loss of the normal power source, the operator has available in the oontrol room the necessary annunciation and manual controls to operate tha appzopriate circuit breakers.

The normal auxiliary power system provides adequate power to operate all the station auxiliary loads necessary for plant opeza tion.

The power sources for the plant auxiliary power supply axe sufficient in number and capacity, and of such electrical and physical independence that no single probable event could interrupt all auxiliary power at one time.

Loads important to plant safety are split and diversified between switchgear busses'nd means axe provided for rapid location and isolation of system faults.

8.9-8

BFNP In the event of a total loss of al I normal auzil iary power system

souroes, auxiliary power is supplied from standby diesel generator units located on the site (sa'fety-related boards only).

The multiplicity of lines feeding the 500-RV and -I61 kV switchyards, the redundancy of transformers and buses within the

plant, and the divisions of critical loads between

buses, yield a

system that has a high degree of reliability.

Also, the design utilizes physical separation of buses and service components to limit ox localize the consequences of electrical faults or mechanical accidents occurring at any point in the system.

The unit is designed to shut down safely on complete loss of offsite electrical powers Standby power is required after shutdown to provide auxiliary cooling, lighting, and miscellaneous services to permit access to plant areas and to assure continued removal of decay heat only if the normal external power souxces become unavailable.

Shutdown power normally comes from outside sources as described above.

A high degree of reliability in the auxiliary power system contributes to continuity of operation and hence to safety.

(s If the unit 3 generator is incapacitated the generator breaker will be opened and auxiliary power backfed from the 500-kV system.

There are still three other independent sources of auxiliary power:

the common station service transformers, the cooling towex transformers and the onsite standby diesel generator units.,

Each source may be connected to feed the

'shutdown boards, and each has capacity for operation of all systems required to shut down the unit and maintain it in a

safe shutdown condition.

This moots the requirement of GDC 17 of two physically independent circuits.

At no time will loss of auxiliary power prevent scram since stored pneumatic energy and normal reactor pressure or stored pneumatic energy alone at low reactor pressure are the means of driving in the control rods.

The normal auxiliary power system is operated and instrumented either at the individual unit oontrol boards or at the electrical control boaxd which is common to all three units.

The electrical control board is located between units I and 2 control boards.

The control functions of the normal auxiliary power system which are unit-related

only, such as feeder and load breaker operation, axe located on the unit oontxol boards.

The electrical control functions which are shared by units I, 2, and 3, such as feeder 8.9-9

BFNP breaker operation to the common 4160-V board, are located on the electrical control board.

Unit 3 is provided with a centralized control room physically separated from the common control xoom for units I and 2, but sharing the same control building bay.

The principal elements of the normal auxiliary electrical system are shown on the electrical system key diagrams in Figures 8 3-la",

8 '-lb and 8.3-2.

All plant auxiliaries except the reactor feedwater

pumps, high-pressure coolant injection pump, and reactor core isolation cooling system pump (these are steam turbine-driven) are powered by electric dxives.

Under staxtup, sh'utdown, and for normal operating conditions, all loads associated with the reactors and turbine-genexator sets are supplied from the unit station service transformers.

Loads associated with the rest of the plant and systems common to units I ~ 2, and 3,

are supplied from the common station service transformers.

Recirculation pump boards 1

and 2 supply only the variable frequency generator'ets of the recirculation pump motors.

The high voltage drop incurred during starting of these large motors can be confined to these

buses, and will have no effect on the rest of the system.

4160-V unit boards 3A, 3B, and 3C, supply the remainder of the motors assooiated with the reactors and turbine-generator sets.

Safety-related loads required during shutdown conditions are supplied from the shutdown boards.

Power to these shutdown boards is normally supplied fx'om the 4160-V unit boards.

If necessary, power will be supplied to the shutdown boards from the standby diesel generators.

All shutdown boards're located within seismic Class I Buildings.

Each 4160-V shutdown board and each 480-V unit shutdown'board and theix transformers are physically isolated from each othex'.

If a unit generator is incapacitated the unit station service transformers, the common station service

system, and cooling tower transformers will be used before it becomes necessary to use the standby diesel generators.

If all sources of power other than the diesel generatox s are lost, provision is made for manual connecting the diesel generators to back feed a

4 kV unit board for the purpose of operating a main turbine condenser as an alternate reactor'ooling heat sink.

Interlocks prevent paxalleling the diesel generators with the normal auxiliary power sources should they return to availability'perati'on in this mode does not interfere with the logic for automatic oonnection of diesel generators for independent operation upon receipt of an accident signal.

8.3-10

BFNP Loads and systems which are common to units 1, 2, and 3 except standby emergenoy

systems, are supplied from common boards A and B which are normally fed by the common station service transformers.

8.3.7 I

T

\\

An extensive and exacting inspection and testing program has evolved as s tandard procedure for all TVA generating s tati.on construction.

The procedures are formai ized by data

sheets, oheck sheets and reports.

The program is expanded in the case of nuclear plant construction to include tests required to assure reactor safety and to inolude expanded operational tests of funotions related to reactor safety.

The discussion here is limited to quality assurance and field setting of components in the auxiliary power systems 8.3.7.1 All transformers, switchgear, and motor control centers are sub)ected, as a minimum>

to factory tests required under NEMA and ANSI standards.

These tests include dielectrio tests, electrical and meohanical operation of circuit breakers and contactors, and mea'surement of transformer constants.

Manufacturer's certified test reports are submitted to TVA for review and approval.

TVA maintains a force of inspectors who review the manufacturer's work during production, and who permit release of equipment for shipment from the factory only after assuring themselves that the equipment is complete>

has been manufactured in accordance with the specifications, that specified tests have been performed, and that the equipment is of high quality.

The equipment is again inspected for damage in shipment before accoptance at tho

)obsite.

TVA construction forces perform all tests required to determine that the auxiliary power'quipment will function saf ely,

reliably, and as designed.

Those tests are made prior to oner g iz in'g the equipment

~

Examples of the se tests are:

de ta iled check. of small wiring, meggering of all electrical power conductors>

phase relation and motor rotation checks.

All protective relays and circuit breaker series overcurrent devices are set and tested with laboratory equipment in accordance with setting instructions issued or approved by design departments.

8.3-11

General Bemarks Table 8.3-Auziliary power Supplies and Bus Transfer Schemes - Sheet 1

1.

All breakers which may supply a given bus are interlocked to prevent paralleling supply sources.

f i

between normal and alternate'ources.

Manual transfers of all 4160-V 2.

Each bus has provision for manually trans err ng e

w buses are high speed ezcept as otherwise indicated.

3.

Bus transfers whLch are initiate automat ca y

y n

d ti 11 by undervoltage are time coordinated to avoid needless transfer of buses toward the load.

4.

The term 'high-speed transfer app es o

li t

4160-V bus transfers between stored-energy circuit breakers-whLch are controlled for a dead time not ezceeding 5 cycles.

5.

ansfer' lies to 4160-V bus transfers supervised by bus residual relays, which permit either the norma breaker to close when the bus voltage decays to a value safe for normal supply breaker to trip or the alternate supply rea er o

c ose w

connected motors.

Normally the residual voltage relay will be set at 30% voltage.

6.

Automatic bus transfer Ls bloc e

y opera on bl k

d tio of bus overcurrent or current differential relays for all 4160-V buses.

Ezcept for those minor uses norma 480-V b ally supplied from main 480-V buses of the normal auzlllary power system all 480-V automatic bus transfers are blocked by bus overcurrent protective devices.

system.

Auxiliary Powex Supplies and Bus Transfer Schemes - Sheet 2

~I B

4160-V Start bd 1 - Start Bus 1A COM SS TR A, X-winding fed from Athens or Trinity 161 kV lines COM SS TR Bi X-winding fed from Athens or Trinity 161 kV lines Automatic high speed transfer from tho normal to the alternate source is initiatod by operation of protoctive relays for tho normal source common station scrvico trans-former, or for tho 161-kV line feeding that transformer.

Automatic delayed transfer fxom the normal to the alternate source is initiated by time delay undervoltage relays.

The bus vill bo automatically returned to its normal source 40 cyclos after return of voltage on the normal source.

This time delay is to avoid needless switching duxing 161-kV line reclosing opera-tions.

If alternate source voltage is abnormally low, tho normal source breaker vi.ll not trip (no transfer); if the normal sourco broaker trips again within lS seconds, it will lock out with an alarm, and operator reset vill be required.

4160-V Start bd 1 - Start Bus 1B COM SS TR Bp X-winding, fed from Athens or Trinity 161 kV linos COM SS TR A, X-winding fed from Athens or Trinity 161 kV lines (Soe Remarks under Item 1) 4160-V Start bd 2 - Start Bus 2A COM SS TR A, Y-winding fed from Athens or Trinity 161 kV lines COM SS TR B, Y-winding fed from Athens or Trinity 161 kV lines (Soe Remarks under Item 1) 4160-V Start bd 2 - Start Bus 2B COM SS TR B Y-winding fed from Athens or Trinity 16'1 kV lines COM SS TR A, Y-winding fed from Athens or Trinity 161 kV linos (See Remarks under Item 1) 4a 4160-V Bus Tio Board Cooling Towor Transf TCT1 Cooling Tower Transf TCT2

<<Manual transfer from the normal power source to tho alternate power

source, or visa versa is provided by operating bxeakers 1920 and 1930 by means of control switches fox these breakers provided, on the 4160-V cooling tower switchgear A.

Automatic dolayod transfer from normal to alternate power source is initiatod by a time delay undervoltago relay

Tab I a 8.3-1 huziliary Powas Supplies and Bus Transfer Schemes - Shoat 3

~I B

M B

monitoring TCTI vol tago.

hl ternate I Shutdown Bus I (4160-V) 4 kV unit bd Ih or 2B of psosalectcd on-line unit 4 kV unit bd 2B or Ih (that source not preselocted for

'normal' hltosnata 2

Same 4 kV unit bd of pso-scloctad unit, but fad from start bus Ih or IB hltarnate 3

Two di,osal genosators if required for back-faoding a pro-selected 4 kV unit bd (Ih, 2B)

See also semasks fos items 13'4, IS ~

and 16 hl tasnato 4

Bus tie Boasd The two indopondant shutdown busos normally supply 4160-V power to assigned 4160-V shutdown boards, with oach bus serving as tho normal source to two boards and as the altosnatc source to the two othes boards.

Of the two possible feedess to each shutdown bus fsom the two 4

kV uni.t boards, ona feedos is pra-selected manually as tha normal source to that bus.

hutomatic delayed transfer fsom the nosmal to an alternate I source is initiated by undesvoltage on tha normal sousco.

hutomatic high-spood transfer from tha nos-mal to an alternate I sousce is initiated when the normal source 4

kV unit boasd normal source breaker trips.

If an altesnate I source is not available.

the transfer is psavonted, and tho normal source becomes altosnato 2

sousce.

hutomatic tsansfor is blocked after time delay in tha presence of an accident signal.

hltesnata 3

and 4 sources may be solectad manually only.

hltesnate I Shutdown Bus 2 (4160-V) 4 kV unit bd IB or 2h> of pra-selected on-line unit 4

kV unit bd 2h or IB (that sousco not pre-selocted fos 'normal' (Saa Remarks under Item S) hltosnato 2

Sama 4 kV unit bd of pse-selected

unit, but fad from start bus Ih or IB hltarnata 3

Two diasol generators,

~I B

d M

B Auxiliary Po~er Supplies snd Bus Transfer, Schemes - Sheet 4

P S

~Ns~

~Ae~

if required for back-feeding a

pre-selected 4

kV unit bd (1B, 2A)

See also xemarks for items 13> 14, 15, snd 16 Alternate 4

Bus tie board 4 kV Recirculation Pump Boards:

(a)

Unit 1,, Pump M-G Set 1A Board I (b)

Unit 1 ~

Pump M-G Set 1B Board 1

(c)

Unit 2 ~

Pump M-G Set 2A Board 2

Unit SS TR 1A Y-winding Unit SS TR 1A Y winding Unit SS TR 2A Y-winding Start Bus 2A Start Bus 2B Start Bus 2A Automatic high-speed transfer from the normal to the alternate source is initiated by main generator unit trip relays.

Automatic delayed transfer from the normal to the alternate source is initiated by high-speed voltage xelay.

(d)

Unit 2, Pump M-G Set 2B Board 2

(e)

Unit 3, Pump M-G Set 3A Board 3

(f)

Unit 3, Pump M

G Set 3B Board 3

Unit SS TR 2A Y-winding Unit SS TR 3A Y-winding Unit SS TR 3A Y-winding Start Bus 2B Start Bus 2A Start Bus 2B 8

4 kV Unit Boaxds

~ Unit 1

(a) 4 kV unit bd 1A Unit SS TR 1B X-winding Alternate 1

Start bus 1A Automatic high-speed transfer from the normal to the alternate 1 source is initiated by generator breaker failure relaying, USST protective relaying>

main transformer pxotective relaying, or a

common trip of both 500-kV switch yard breakers located between the 500-kV switchyard buses and the 500-kV main transformer bank.

Automatic

()

~I B

N B

Table 8.3-1 huxiliary Power Supplies aad Bus Tr nsfcs Schomes Sheet 5

P w

S Em@1

~Luu~

delayed transfer from the normal to the el tcraatc 1 sourco is initiated by a

timo delay voltage relay.

hl ternate 2

Backfood from shut-down buses manual only through backfeod switches hltesnate (b) 4 kV unit bd 1B Unit SS TR 1B I-winding Start bus 1B hl ternate 2

Backfeed from shut-down bus Provisions are included for backfecding diesel-generator power from thc 4-kV shutdown boasds into tho 4,160-V unit boasds fos hot standby shutdown cooling if all plant power, other than diesel-generator powers is lost.

Tho plant desiga iacludcs a modo of operation fos ruaning oao condenses circulating water pump to permit uso of the condensers as a heat sink.

hl tosnate 1

(c) 4 kV uait bd 1C Unit SS TR lh X-winding Start bus 1B 4 kV Unit Boardsi Unit 2 hlteraate 1

(a) 4 kV unit bd 2h Unit SS TR 2B X-winding Start Bus lh hl ternate 2

Backfeod from shut-down buses hlternate 1

(b) 4 kV unit bd 2B Unit SS TR 2B I-winding Start Bus 1B

Table 8.3-1 Auzlliary Power Supplies and Bus Trsnsfe Schemes Sheet 6

~I B

P w

S Alternate 2

Backfeed from shut-down buses Alternate 1

(c) 4 kV unit bd 2C Unit SS TR 2A X-winding Start bus 1A 10 4 kV Unit Boards, Unit 3

Alternate 1

(a) 4 kV unit bd 3A USST 3B X-winding Start bus IA Automatic high-speed transfer from the normal to the alternate 1 source is initiated by generator breaker failure relaying, USST protective

relaying, main transformer protective relaying or a

common trip of both 500-kV switch yard breakers located between the 500-kV switch yard buses and the 500-kV main transformer bank.

Automatic delayed transfer from the normal to the alternate 1 source is initiated by a

time delay voltage relay.

Alternate 2

Backfeed from shut-down.boards Manual only through backfeed a~itches.

Alternate 1

(b) 4 kV unit bd 3B USST 3B Y-winding Start bus 1B Alternate 2

Backfced from shut-down boards Provisions are included for back-feeding diesel-generator power from the 4-kV shutdown boards into the'160-V unit boards for'ot standby shutdown cooling if all plant power, other than diesel-generator power, is lost.

The plant design includes a

mode of operation for running one condenser circulating water pump to

~I Bo Table 8.3-1~

Auziliary Power Supplies and Bus Transfer Schemes Sheet 7

P w

S

~N

~e~

- ~

permit use of the condensers as a

heat sink.

Alternate 1

(c) 4 kV unit bd 3C USST 3A X-winding Start bus 1A 11 4 kV Common Board A

Start bus 1A Unit SS TR 1A, X-winding Automatic delayed transfer from the normal to the alternate source is initiated by undervoltage on the normal

source, sub)ect to voltage check on the alternate source.

Automatic delayed transfer back to the normal source is initiated by retuzn of normal voltage on the normal source.

Manual transfers in either direction aze delayed

type, 12 4 kV Common Board B

Start Bus 1B Unit SS TR 2A, X-winding 13 4

kV Shutdown Board A

Shutdown Bus 1

Alternate 1

Shutdown Bus 2

(See also remarks for items 5

and 6.)

AIterna te 2

Automatic delayed transfer from thc normal to Alternate 1 source is initiated by undervoltage on the normal

souzce, and automazic return is initiated by normal voltage on normal source.

Automatic voltage transfers from normal to Alternate 1

are blocked in thc presence of an accident signal.

Diesel generator A

Alternate 3

Manual>

access con-nection to diesel generator 3A via 4-kV shutdown board 3EA Automatic delayed transfer from the normal to Alternate 1 sonrce is initiated by undcrvoltage on thc no'zmal

source, and automatic return is initiated by normal voltage on normal source.

Automatic voltage transfers from normal to Alternate 1

are blocked in the presence of an accident signal.

Jllcla 0 ~ 4 k

~I B

husiliary Power Supplies and Bus Transfe'z Schcmcs Sheet 8

P S

14 4

kV Shutdown Board B

Shutdown Bus I hl ternate I Shutdown Bus 2

Alternate 2

Diesel ganeratos B

Alternate 3

Manual, access con-nection to diesel generator 3B via 4-kV shutdovn board 3

EB Automatic delayed tsansfer from

'the normal to alternate I source is initiated by undezvoltage on the normal

source, and automatic return is ini.tiatod by nosmal voltage on normal source.

Automatic voltage tzansfars fsom normal to Alternate 1 aza blocked in tha prasanco of an accident signal-15 4 kV Shutdown Board C

Shutdown Bus 2

Alternate I Shutdown Bus I All diesel generators arc automatically started by an accident

signal, or by loss of voltage on its shut-dovn board for 1.$

seconds, or dagsadad voltage for 4 seconds After 5 seconds without voltage on the shutdown board, all its supply breakers and all its loads azccpt 4160-480-V transformors are automatically tripped.

Alternate 2

source is then automatically connected.

Manual retusn to thc normal auziliary power system is permitted if normal ausil iasy povcs system voltage setuzns and if a unit is not in aasly stage of accident.

Alternate 2

Diesel generator C

hl tesnate 3

Manual, access to diesel generator 3C via 4-kV shutdown board 3

BC 16 4 kv Shutdown Boasd D

~.

Shutdown Bus 2

Alternate I Shutdown Bus I

0

~I B

M B

Tabl e. 8.3-1 Auziliary Power Supplies and Bus Transfer Schemes - Sheet 9

EazuaL Alternate 2

Diesel generator D

Alternate 3

Manuals access to diesel generator 3D via 4-kV shutdown board 3

ED Alterna to 1

16a 4 kV Shutdown Board 9EA 4

kV Unit Board 3A 4

kV Bus Tie Bd Provision is nade to nanually select alternate 3 source.

Alternate 2

Diesel generator 3A Alterna te 3

Manual, access to diesel generator A via 4-kV shutdown board A

Alternate 1

16b 4 kV Shutdown Board 9EB 4 kV Unit Board 9A 4 kV Bus Tie Bd Provisions are included for bac?feeding diesel gonerator power fron the shutdown boards into the 4160-V unit boards for hot standby shutdown cooling if sll plant power, other than diesel generator power, is lost.

For this purpose, neans are provided to manually synchronise 4-kV shutdown boards.

Alternate 2

Diesel generator 3B Alternate 3

Manuali access to diesel generator B

via 4-kV shutdown board B

Table 8.3-1 Ausiliary Power Supplies and Bus Transfer Schancs - Sheet 10

~I B

M B

P S

hl t os na tc I 16c 4 kY Shutdown Board 3EC 4 kV Unit Board 3B 4 kV Bus Tie Bd Alternate 2

Die eel generator 3C Alternate 3

Manual>

access to diesel generator C

via 4-kV shutdown board C

Alternate 1

16d 4 kV Shutdown Board 3ED 4 kV Unit Board 3B 4

kV Bus Tic Bd Alternate 2

Diesel generator 3D Alternate 3

17 480-V Water Supply Board Manual>

access to diesel generator D via 4-kV shutdown board D

(a)

Bus 1

4 kV unit bd IB via TR TW1 Alternate I Bus 2 (Iten 17b) hutonatic transfos fran the nominal to the alternate source is ini-tiated by tine-undesvoltaga on tha nornal sousca.

Roturn to tho nornal sousce is autonatic upon retusn of voltage to tha nornal source

~

(b)

Bus 2

4 kV unit bd 2B via TR TW2 Altomato 2

Bus 3 (Iten 17c) hl tornate 1

Bus 1 (Item 17a)

~I B

N B

Table 8-9-1 h ili ry Pover Supplies and Bus Transfer Schemes Sheet 11 ux a

P v S

(c)

Bus 3

18 480-Y Unit Boards (a)

Unit 1, 480-V Unit Bd 1h 4 kV unit bd 3B via TR TW3 4

kV unit bd lh vja TR TUlh hl ternate 2

Bus 3 (Item 17c) hl ternate 1

Bus 2 (Item 17b) hl ternate 2

Bus 1 (Item 17a)

Alternate 1

4 kV com bd B

(vja TR TEB)

Automatic transfer from the normal to the alternate source js initiated by time-undervoltage on the normal source.

Return to the normal source is automatic upon return of voltage to thc normal source.

(b)

Unit 1, 480-V Unit Bd 1B (c)

Unit 2. 480-Y Unit Bd 2A 4 kV unit bd 1B via TR TU1B 4 kV unit bd 2A via TR TU2h Alternate 1

4 kV corn bd B

(via TR TEB)

Alternate 1

4 kV corn bd B

(via TR TEB)

Alternate 1

(d)

Unit 2, 480-V Unit Bd 2B (e)

Unit 3, 480-V Unit Bd 3A (f)

Unit 9, 480-V Unit Bd 3B 19 480-V Lighting Boards 4 kV unit bd 2B via TR TU2B 4 kV unit bd 3A v ja TR TU3h 4 kV unit bd 9B via TR TU9B 4 kV com bd A

(via TR TEA)

Alternate 1

4 kV com bd h (vja TR TEA)

Alternate 1

4 kV com bd h (via TR TEA)

~I B

M B

Table 8.3-1 Auziliary Power Supplies and Bus Transfer Schemes Sheet 12 P

8 (a) 480-V Lighting Bd 1

4 kV 'corn bd A

via TR TL1 4

kV corn bd B

(via TR TEB)

Transfer between sources is manual only.

Each 480-V lighting board serves as the power source, via single phase voltage regulators and 480-V to 240/120-V stepdown trans-

formers, for three 240/120-V lighting boards per unit.

These unit lighting boards serve various distribution cabinets in the plant.

(b) 480-V Lighting Bd 2

(c) 480-V Lighting Bd 3

4 kV com bd A

via TR TL2 4 kV corn bd B

via TR TL3 4 kV com bd B

(via TR TEB) 4 kV corn bd A

(via TR TEA) 20 480-V Common Boards (a) 480-V Common Bd 1

Bus A

Bus B

(b) 480-Y Common Bd 2

Bus A

Bus B

(c) 480-Y Common Bd 3

Bus A

Bus B

4 kV com bd A

via TR TC1A 4kV corn bd B

via TR TC1B 4 kV com bd A

via TR TC2A 4kV com bd B

via TR TC2B 4 kV com bd A

via TR TC3A 4 kV com bd B

via TR TC3B Bus B of Item 20a Bus A of Item 20a Bus B of Item 20b Bus A of Item 20b Bus B of Item 20c Bus A of Item 20c Automatic transfer from the normal to the alternate source is initiated by time-undervoltage on the normal source.

Return to the normal source is automatic upon return of voltage to the normal source.

21 480-V Service Building Main Board Bus A

Bus B

4 kV corn bd A

via TR TSBA 4 kV com bd B

via TR TSBB Bus B of Item 21 Bus A of Item 21 Same as remarks for Item 20

~

22 480-V Radvaste Boards Board 1

480-V Serv Bldg Bd (item 21)

Bus A

1) 480V con bd 1

2) 480 V Diesel Auz Bd-A If the normal feed should faili a manually actuated transfer to the alternate source may be made.

(

I

~I B

M B

Tabl c 8 ~ 3-1 huriliary power Supplies and Bus Transfer Schemes - Sheet 13 P

S Board 2

480-V corn bd 1

I tern 21 Bus B

1) 480-V Serv Bldg-Bd (itom 21)

2) 480-V Diesel huz Bd-B 23 480-V Auziliasy Boiler Bd Bus A

Bus B

480-V com bd Bus A

480-V corn bd 3, Bus h

480-V corn bd 1.

Bus B

480-V corn bd 1, Bus B

Both buses arc normally fed from source

shown, and with te manually operated bus tic breaker closed.

Automatic transfer of both buses from tha normal to tha alternate source is initiated by timo-under-voltage on tha normal source.

Retusn to tho normal sourco is automatic upon saturn of voltage to tha normal source.

24 480-V Control Bay Vont Boards Board A

Board B

4SO-V shutdown Bd 1A 480-V com bd 1

480-V corn Bd 3

480-V shutdown Bd 3B Automatic Transfer from tho nosmal to the alternate source if ini-tiated by time-undervoltago on tho nosmal source.

Retusn to thc normal source is automatic upon retusn of voltage to the nosmal sousco.

The nosmally closed, manually operated bus tie breaker provides for main-tenanco on one bus section while keoping the othas bus section energized and in oposation.

25 480-V Turbine NOV Boards (a)

. Unit 1, Board lh 480-V unit bd 1A 480-Y corn bd 1, Bus A

Automatic transfer from tha nosmal to the altesnata source is initiated by time-undcrvoltaga on the normal sourco.

Rctusn to the normal source is automatic upon return of voltage to tha normal source.

(b)

Unit 1, Board 1B (c)

Unit 1 ~ Board 1C (d)

Unit 2, Board 2h (a)

Unit 2, Board 2B (f)

Unit 2> Board 2C 480-V unit bd 1B 480-V unit bd 1B 480-V unit bd 2h 480 V unit bd 2B 4 SO-V uni t bd 2B 480-V corn bd 2,-Bus B

480-V corn bd 2-Bus B

480-V com bd 3-Bus B

480-Y corn bd 2-Bus B

480-V corn bd 2-Bus h

~I B

N B

Table 8 ~ 3-1 huziliary Power Supplies and Bus Transfer Schemes Sheet 14 P

w S

e (g)

Unit 3i Board 3A (h)

Unit 3, Board 3B (i)

Unit 3, Board 3C 480-V Condensate Demin-eralixer Boards (a)

Unit 1

480 V unit bd 3A 480-V unit bd 3B 480-V unit bd 3B 480-V unit bd 1A 480-V com bd 3-Bus h.

480-V corn bd 3-Bus B

4 80-V com bd 2-Bus A

480-V shdn bd 1B In case of failure of the normal

source, automatic transfer is made to an energized alternate source.

Upon restoration of the normal

source, automatic, return to normal is effected.

(b)

Unit 2 (c)

Unit 3

480-V unit bd 2A 480-V unit bd 3A 480-V shdn bd 2B 480-V shdn bd 3B 21 '80-V Reactor Building Vent Boards (a)

Unit 1, Board 1h (b)

Unit 1.

Board 1B (c)

Unit 2, Board 2h (d)

Unit 2, Board 2B (e)

Unit 9, Board 9h (f)

Unit 3> Board 3B 28 480-V Turbine Building Vent Boards (a)

Unit 1, Board 1h

'b)

Uni t I > Board 1B (c)

Unit 2 ~ Board 2h (d)

Unit 2, Board 2B (e)

Unit 3, Board 3h (f)

Unit 3, Boaqd 3B 480-V unit bd lh 480-V unit bd lh 480-V unit bd 2A 480 V unit bd 2A 480-V unit bd 3h 480-V unit bd 3A 480-V unit bd lh 480-V unit bd 1B 480-V unit bd 2h 480-V unit bd 2B 480-Y unit bd 3h 480 V unit bd 3B 480-V com bd 1-Bus B

See remarks of Item 24.

4 80-V corn bd 1-Bus B

480-V com bd 9-Bus A

480-V com bd 3-Bus h

480-V corn bd 3-Bus B

480-V corn bd 1-Bus A

See remarks on Item 24.

480-V corn bd 2-Bus B

480-V corn bd 3-Bus B

480-V corn bd 2-Bus h

480-V com bd 3-Bus h

480-V corn bd 2-Bus h

'0

~I B

H n

B Table 8.3-1 Auziliary Power Supplies and Bus Transfer Schemes - Sheet 15 P

w S

29 480-V Shutdown Boards (b)

Unit 1 i 480-V Shutdown Bd 1B 4 kV shutdown bd C

via TR TS1B 4 kV shutdown bd B

via TR TS1E (a)

Unit 1, 480-V Shutdown Bd 1A 4 kV shutdown bd A

4 kV shutdown bd B

via TR TS1A via TR TS1E Transfer from the normal to the alternate source is manual.

Interlocking is provided to prevent manually transferring to a faulted board and to prevent paralleling two sources'emark (a)

(c)

Unit 2, 480-V Shutdown Bd 2A 4 kV shutdown bd B

via.TR TS2A (d)

Unit 2, 480-V shutdown Bd 2B 4 kV shutdown bd D

via TR TS2B (e)

Unit 3, 480 V Shutdown Bd 3A 4kV shutdown bd 3EA via TR TSSA (f)

Unit 3, 480-V Shutdown Bd 3B 4 kV shutdown bd 3EC via TR TS3B 30 480-V Reactor NOV Boards 4

kV shutdown bd C

via TR TS2E 4

kV shutdown bd C

via TR TS2E 4

kV shutdown bd 3EB via TR TS3E 4

kV shutdown bd 3EB via TR TS3E (c)

Unit 1, 480-V Reac HOV Bd 1C 480-V Shutdown Bd 1B 480 V Shutdown Bd 1A (a)

Unit 1, 480-V Reac HOV Bd 1A 480-V Shutdown Bd 1A 480-V Shutdown Bd 1B (b)

Unit 1, 480-V Rcac NOV bd 1B 480-V Shutdown Bd 1B 480-V Shutdown Bd 1A Remark (a)

Remark (a)

Remark 29(a)

(d)

Unit 1, 480-V Reac MOV Bd 1D 480-V Shutdown Bd lA via NG se t (e)

Unit 1, 480-V Reac NOV Bd lE 480-V Shutdown Bd 1B via NG set 480-V Shutdown Bd 1B via NG se t 480-V Shutdown Bd 1A via MG set Automatic transfer from the normal to the alternate source is initiated by time-undervoltage on the normal source.

Return to the normal source is manual upon return of voltage to the normal source.

Isolation between normal and alternate is provided by HG sets.

Automatic transfer from the normal to the alternate source is initiated by time-undervoltage on the normal source.

Return to the normal source is manual upon return of voltage to the normal source.

Isolation between normal and alternate is provided by HG sets.

Table 8.3-1 Auxiliary Powcz Supplies and Bus Tran z Schemes - Sheet 16

~I B

P S

(i)

Unit 2, 480-'V Res c MOV Bd 2A 480-V Shutdown Bd 2A 480-V.Shutdown Bd 2B Transfer from the nox'mal to thc alternate source is manual.

Inter-locks prevent transferring a fault from one source to another and paralleling so'ux'cod (g)

Unit 2i 480-V Reac NOV Bd 2B 480-V Shutdown Bd 2B 480-V Shutdown Bd 2A Transfer from the normal to the alter-nate source is manual.

Interlocks prevent transferring a fault from one source to another and paralleling sour ces

~

(h)

Unit 2, 480-V Reac NOV Bd 2C 480-V Shutdown Bd 2B 480-V Shutdown Bd 2A Transfer from the normal to the alternate source is manual.

Inter-locks prevent transferring a fault from one source to another and paralleling sources.

(i)

Unit 2, 480-V Reac HOV Bd 2D 480-V Shutdown Bd 2A via M-G set 480-V Shutdown Bd 2B via N-G set Automatic transfer from the normal to the alternate source is initiated by time-undervoltage on the normal source.

Return to the noxmal source is manual upon return of voltage to the normal souxce.

Isolation between normal and alternate is provided by M-G sets.

(j)

Unit 2i 480-V Reac HOV Bd 2E 480-V Shutdown Bd 2B via M 0 set 4SO-V Shutdown Bd 2A.

via MG se t Automatic transfer from the normal to the alternate souxce is initiated by time-undcrvoltage on the normal source.

Return to the normal source is manual upon return of voltage to the normal source.

Isolation between normal and alternate is provided by H-G sets.

(k)

Unit 3, 480V Reac NOV Bd 3A 480V Shutdown Bd 3A (1)

Unit 3, 480 V Reac HOV Bd 3B 480 V Shutdown Bd 3B 480-V Shutdown Bd 3B 480-V Shutdown Bd 3A Transfer from the normal to the alternate source is manuax.

Inter-locks prevent transferring a fault from onc source to another and paralleling sources.

Transfer from thc normal to the alternate source is manuax.

- Inter-locks prevent transferring a fault from one source to another and paralleling sources'm)

Unit 3 i 480-V Reac MOV Bd 3C s

480-V Shutdown Bd 3B 480-V Shutdown Bd 3A Transfer from the normal to the alternate source is manual.

Intez-

Tabl e 5->-l Auxiliazy Power Supplies and Bus Trains fe Schomes - Sheet 17 8

locks prevent transferring a fault from one source to another and paralleling sources.

(n)

Unit 3, 480-V Rose MOV Bd 3D 480-V Shutdown Bd 3A 480-V Shutdown Bd 3B via MG set via MG sat Automatic transfer fsom tha nosmal to tha alternate source is initiatod by time-undervoltage on the normal source.

Return to tha noxmal sousoa is manual upon return to voltago to the normal source.

Isolation betwoen normal and altaznata is provided by MG sots

~

(o)

Unit 3

~ 480-V Reac MOV Bd 3E 480-V Shutdown Bd 9B 480>>V Shutdown Bd 3A via MG se t via MG sat Automatic transfer from tho normal to the alternate source is initiated by t ime-unde rv ol tago on the normal sourco.

Return to the normal source is manual upon ratuxn to voltage to the normal sources Isolation between nosmal and alternate is provided by MG sots

~

91 480-V Diesel Auxiliary Boards (a) 480-V Diesel Aux Bd A

4 kV Shutdown Bd A via TR TDA 4

kV Shutdown Bd B

via TR TDE Transfor from tha nosmal to the al texnate source is manual.

Inter-locks prevent tsansferring a fault from one source to another and paralleling sousces.

(b) 480-V Diesel Aux Bd B

4 kV Shutdown Bd D

via TR TDB 4

kV Shutdown Bd B

via TR TDE Ramark (a)

(c) 480-V Diesel Aux Bd 3EA (d) 480-V Diesel Aux Bd 3EB 480-V Shutdown Bd 3A 480-V Shutdown Bd 3B 480-V ShutdownBd 3B 480-V Shutdown Bd 9A Remark (a)

Remark (a)

BFNP n

D 8.4.1 P

0 The objective of the 120volt a-c power supply and distribution system is to supply 120-volt a-c power to all equipmcnt and instrumentation requiring it during all modes of plant operation.

8.4.2 P

De B

s The 120-vol t a-c po~er supply and distribution system shall be capable of supplying all required

loads, through the use of several independent

systems, depending on the continuity of power required by each load.

120-volt a-c power supply and distribution is accomplished by three systems.

These systems are:

a.

120-volt a-c Instrument and Control Power Supply b.

Plant Preferred and Nonpreferred 120-volt a-c System (g 'ni t Pre ferred 120-vol t a-c System The 120-volt a-c power supply and distribution system and its relation with other plant electxical systems is shown in Figure 8.4-1.

r 8.4.3.1 120-V I

u n

C rol P

we Su The 120-volt a-c instrument and control power supply consists of six instrument and control buses (two for each unit).

Each bus receives its normal power supply from the appropriate 4 80-volt shutdown board through a

480 208/120-volt a-c 30 instrumentation and contxol transfoxmer and a 208-208/120-volt a-c 30 line voltage regulator.

The line voltage regulator is a

regulating transformer with a 1:1 turns ratio and will maintain an output voltage of 208/120-volt a-c

+

1 percent for an input range of 208-volt a-c

+

10 percent,

-20 percent.

The 120-volt a-c instrument and control power supply and loads axe shown in Figurc 8.4-2.

On loss of power supply to an I and C transformer, only the power to those I and C loads of one redundant channel will be lost.

On loss of normal auxiliary power,'ll I and C loads will lose power until the diesel generators have picked up the 480-volt 8.4-1

BFNP shutdown board loads.

8.4.3.2 P

P n

N n

e S

The plant preferred and nonproferrod a-c system consist di'stribution buses as shown in Figure 8.4-2, volume 4, of'FNP's FSAR.

The buses normally receive power from lighting board.

The profex'red bus has as an alternate power a 250-volt d-c motor-dxiven generator (plant prof set).

The plant preferxed M-G set is started on loss o

to the bus and automatic transfer made on px esence of v from the generators The M-G set will pick up all loads not require manual start.

Plant preferred loads will 1

wh'il e the M-G set is started and transfer is made.

The nonprefcrred bus loads will not be picked up by the M-G s of two'hapter 8

an a-c source of orred M-G f voltage ol tage that do ose power set.

Txansfer of the bus back to the normal power supply is manual.

8.4.3.3 Un P

S em The unit preferred a-c

system, for each unit, consists of a

distribution bus with a

M-M-G set as tho primary source of supply>

a backup source of supply from a

M-M-G set for another.

unit, and an alternate source from the appropriate unit 480-volt shutdown board thxough the unit preferxcd a-c bus transformer, as shown in Figure 8 '-3, Chapter 8 of BFNP's FSAR.

Each M-M-G sot consists of a

480 volt a,

c motor, a 250-volt d-c motor>

a flywheel, and a 240/120-volt 1 4 a-c generator (all direct coupled) with the necessary controls.

The unit preferred bus is normally supplied from the generator driven by the a-c motor with the flywheel and d-c motor being driven.

On loss of power to thc a-c motor, the d-c motor is automatically energized with the flywheel driving the generator during the transfer period.

Therefore, the unit preferred buses do not lose powex at any time during loss of auxiliary power.

8.4.3.4 120-V

D P

There are four contxol room distribution panels (circuit bxeaker boards) supplied by one ox more of the 120-volt a-c systems.

There is one panel for each unit and one plant panel common to all units.

The 120-volt a-c loads supplied from these panels

'axe shown in Figures 8.7-¹a, b,

c, and d,

Chapter 8 of BFNP's FSAR.

'8.4.4 In All equipment associated with the 120-volt a-c power supply

system, except tho plant preferred M-G set, will normally be in operation.

The plant pxefex'red M-G set and the d-c motor drives 8.4-2

BPNP o f the un i t prof errod h1-6 so ts can be pori cd ical ly energized to ensure operability.

Inspection of all other equipment is accomplished based upon the manufacturer's instructions and sound maintenance practices.

8.4-9

fgOM480YAC SHTON BD 2A (REF 8)

FROM 480YAC SHTOII/ BD ZB (REF 9)

~

'c a

,Qlfk LVR@

BUSA BUS A UNIT 3 480 208V,36, ZN$74 CON'TROL 7SKYA TRANSFORMERS

LYRk, 8LIS B BUS B VIIIIT3 O'AkfE AS BUS A NOTES:

/

ALL BREAKERS SILL HAVE BREAKER 1RIP ALARMCONTACTS (IVO) /IIIIRE0 OUT TO TERMINALBLOCKS FOR CONhfOhI ANhIIUiVCIATIOjV.

LVR-LINE VOLTAGE REGULATOR 208/208-IZO V,3WSOKYA c

~ >>

~ '

P

~

a a

~,

I TFK TFK I

8 3

POLE POLE I

I I

3OA 30A TEF TEF 2

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h.

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'Z I Cb o

h I g Cr)

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(BUS A I

80/

eOZ 8O3 ge zan 806 I(

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TFK TFK I

POLE LE I

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80A TEF 2

POLE 1 ~

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I I'USB 807 808 809 8/D 8//

8/2 I

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BOA TEF 2

POLE REFERENCE

/.

73/E700 Z.

73/ET/7 3

73/E 753 4

73/EV4 5

73/E755 6.

45N749-/

7.

45N/749-2 8.

4SI749-3 9.

4SiV749-4 OlVGS:

ONE LINE DIAG,KEYDIAG OF PLY DC/AIIIST4COhl T AC SYS ONE LINE DIAG,24VOC PtWZSPLYSY ONE LliYE OIAG,UNIT/ CKT Bj(R BO 9-9 AC PANELS ONE LINE DIAG,UNIT2 CA'r BA'R BO 9-9 AC PANELS OiVELINEDIAG,UIIIT3 CKT BKR BO 9-9 ACPAhfELS OIJIE LINE 0/AG,480Y SIITWBOIA ONCE LINEDIAG,480V S//TDIYBOIB ONE LINEDIAG,480V 5/ITWBD 2A 43A WE LINE DIAG,480YSC/rW BO 284 3B

~cca

~aaa Sea aa.

ace c aca caaa cw c aaaa acca aaaa UNIT 3 INSTRVNEN TAT/ON' COAfTROL AC SYSTEM ONE LINE DIAGRAM FIGURE 8'-4-2 I

a

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~~ENCLOSURE 3~~

~~Response~~
to April 8, 1980 letter from T. A. Xppolito to H. C. Parris-
"Requcst for Additional 1:nf'ormation Browns Ferry Units 1, ?,
and 3
Degraded Crid Voltage."
Only Quest!on No.
3 differs significantly from our units 1
an<t 2
~sutimi t;taL.
QUESTION 3
Pr ovide suf't'icient; informat ion (voltage drop analyses) to al,tow our set;point and time delay selected will not cause spur ious separation o
safety buses from offsit;e power during all modes of plant operation (start-up,
~~shutdown, power operation and accident condition) due to automatLc or manual starting of large motors, bulk or sequential loading or automatic transfer of'lectr ical loads.~~
The analyses should inc u e conditions when the safety buses are supplied power from the Unit Auxiliary Transformer, the Start-up/Reserve transformer or other available offsite connections and assuming the need for electr ical power is initiated by an anticipated transient (e.g., unit trip) or an
~~accident, whichever presents the largest load demand.~~
RFSPONSE The 4-IcV shutdown board degraded voltage relaying has two setpoints-upper and lower.
The upper iegraded voltage relaying annunciates when t;he 4-kV shutdown board voltage goes above tt,tiOOV (110 percent of ti,OOOV).
This
.i, tion wilt. alert the operator to tat<e action to reduce the annunc. a ion w
shutdown board voltage.
The sensing relays used for this app ca.L TTE 59N.
These relays r'eset at a fixed percent of their pickup value and have a repcatability of + 1/2 of one percent at; their setpoin e
relay.': are envi.r nnmental.ly and seismically quali,fied.
The decision to annunciate (rather than transfer to ortsite diesel.
power) is based on possible high auxiliary power system voltages when power is being supplied from the 161-!<V source under lightly loaded conditions.
Recent Hrowns Ferry measurements confirm that 4,400V is obtainable under these conditions.
Reduction of the voltage by operator action is preferable to an automatic transfer to onsite (diesel) power.
The lower degraded voltage relaying initiates a shutdown board transfer to standby onsite (diesel) power distribution system when the board steady-state voltage falls below 3,920V for approximately 8-1/2 seconds.
This will ensure proper operation of all safety loads fed from the board.
2 The lower degraded voltage sensing relays are ITE 27/59H.
These r clays reset at a fixed percent of their operating setpoint and have a
repeatahiLity of + 1/2 of one percent, giving a pickup ranpe of
'iy9PO +:?OV.
ln a(idition, these relays have an adjustablr.
y r art point. to
<<l,lOW lOr r(.:3rt Juat ahOVC the relay Operatinp SetpOintve The 27/">9H r clays are sei.smically qualified and the manufacturer (ITE) is required to state the qualified relay life in the operating environment i.f this differs from a minimum of 40 years.
The lower degraded voltage timer relays are Agastat relays, types E7012 and E7022.
These relays are environmentally and seismically qualified.
Tn verifying the lower degraded voltage point acceptability an inhouse computrr program
(-VNEW) was used to perform the calculations for all sources of offsite power.
The summary sheets for computer studies (NIMV
~~12A, By C, and D,~~
NIMV OA, 8, C, and D,
NIMV 20A, 8, C, and D, and NXMV 17C) are attached.
The il-kV safety motors have a normal operating range of +
10 percent with at leant a
15 percent voltape drop allowed on starting.
The
>l60V safety motors are considered to have an operating and starting range of +
10 percent.
A minimum of one percent and a maximum of five percent steady-state voltage drops in feeder cables to the
>ISOV loads is assumed.
Summary sheet NIMV 12A 8
C and D shows the shutdown board voltages for the unit station service transformers carrying maximum unit 3 LOCA loads, with minimum switchyard voltage
(>165-kV).
Under these conditions, the two larpest safety motors (RHR and core spray pump) can be simultaneously started and the steady-state shutdown hoard voltages maintained at greater than
'3 9BOV (3,9?0
+ 1/2 percent).
Summary sheet NIMV 8A B
C and D shows the unit 3 LOCA loads being supplied from the common station service transformers.
With the 161-kV switohyard voltage maintained at 162 ky the two largest sa('et.y motors (BBB and onve spray pump) ran be simul1:aneously started and the strady-state shutdown hoard voltages maini;ained at greater than ~3920V-The 161-kV grid will t)e operated in such a way as to provide a minimum shutdown board voltage of ~39>l0 (3,920
+ 1/2 per cent) to prevent transfer to on" it(. power.
Summary sheet NXMV 20A B
C and D shows the shutdown board voltages for uni,t 3
I.OCA load being supplied from the 161-kV offsite power source throuph the bus tie board with a maximum cooling tower load.
With the
'61-kV switchyard voltage maintained at 16>l-kV the two largest safei;y motors (RHR and core spray pump) can he simul.taneously si;arted and the
steady-state shutdown board voltages maintained at greater than ~3q?OV.
The 161-kV grid will be operated in such a way as to provide a minimum abutdnwn board voltage of 3 940V (3,020
+ 1/2 percent) to prevent tranal'er to onalte power.
As noted on the summary sheets, some shutdown board voltages go below the 3,920V level as their largests motor starts.
The longest expected motor starting voltage transient is approximately four seconds for the RHR pump.
This time is well within the 8-1/2 second setpoint for the degraded voltage relay.
This would not cause a spurious trip from an offsite source.
The diesel generators wi.ll start if the shutdown board voltage stays below 3,920V for more than 4 seconds for motor star ting but transfer to the diesels should not take place.
The proposal on degraded voltage provides for diesel start within seconds based on the degraded voltage relays supplying a start signal in 4 seconds, and diesels being able to carry load within 10 seconds for a normal degraded voltage condition and no accident.
The diesels are started immediately for an accident signal (independent of voltage) and a
degraded voltage transfer to the diesels would be accomplished inside of 10 seconds as required in our FSAR analysis.
Interties exist between units 1, 2, and 3 shutdown boards.
An analysis of those circuits is not provided because they are used only in the long-term after a loss of offsite power for paralleling diesel generator.
A with DG 3A, 8-38, C-3C, and D-3D.
See section 8.5.4.1, pages 8.5-13 and -14 of FSAR.
Summary sheet NIMV 17C gives voltages associated with "worst case" 480V safety loads.
The 480V shutdown hoard 1A and reactor MOV board 18 were chosen for analysis because they are fed by the 480V transformer with the highest impedance and in turn feed the largest motors; therefore, they represent the "worst case" steady state and motor starting condition and are typical of unit 3 boards.
The 4 kV shutdown board A voltage was set
" at minimum (3,92'OV), the boards were fully loaded, and the largest motors associated with each board started successfully.<
The 480V XFMR (TSIA) is set on 5 percent boost tap and all voltages are within acceptable limits.
This roves the acce tabilit of the 3 920V de raded volta e set on 6 ercent boost
~ta "Control bay water chiller voltage (largest 480V shutdown board motor) was 1 volt,l.ow while starting.
This is not considered significant due to the extreme "worst case" conditions.
Concerning the upper degraded voltage setpoint (4400V).
The maximum 4 kV shutdcwn board voltage while being fed fran the 500 kV switchyard is:
Maximum Main Main USST USST Volt = Switchyard X
XFMR X, XFMR X Ratio X
Tap Voltage Ratio.
Tap Volt ~ 550 X 500 X 1.025 X 20.7 X 0.90 (105.5% of 4000V)
This corresponds to a 480V shutdown board voltage of:
4 kv 480V 480V Volt = Board X
XFtE X
YZMR Voltage Ratio Tap Volt ~ 4221V X ~
X 1.05 4160 (ill% of 460V)
Therefore, the upper degraced voltage setpoint cannot be reached when being fed fran the 500 kV switchyard under expected conditions.
Allcwing for a 1-5 percent steady-state voltage drop in the 460V motor feeder cables, all safety motors are operating within their equipnent ratings.
The maximm possible shutdown board voltage while being fed frcm the 161 kV switchyard is:
lfaximun XFYR XFMR Volt = Switchyard X
Ratio X Tap Voltage Volt = 170 kV X
161 X
1.025 At 4400V (110 percent of 4000/v) the upper degraded vo'tage will annunciate to alert the plant operator to reduce t:
4
);V shutdown board vo'age.
0
At 4400V the maximum 480V shutdown board voltage vill be:
Upper Degraded 480V 480V Volt ~
Voltage X
XPÃR X
XPMR Setpoint Ratio Tap Volt ~ 4400 X
4160 X
1 05 Assuming l percent cable drop fran the board to the motor, the 460V safety motors can be subjected to a maximum of 5 percent overvoltage.
To achieve this over voltage, three conditions must exist:
(1) The snutdown boards supplied from the 161-kV (occurs approximately 5
percent of the time)
(2) minimum loading and (3) maximum 161-kV switchyard voltage.
Due to the improbability of the three conditions-occuring simultaneously, this overvoltage possibility is considered acceptable for the frequency and duration that the electrical distri-bution system is expected to be in the assumed configuration.
The degraded voltage setpoint for the unit 3 safety loads is adequate.
(
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v<rv'ccr vctrrrKsscc VALMYAUTIIOIIIYY avcrv BRC4ltlS FCRRY 02F'35199RP rvv~v>~ <r ~ SQ7 Crv'P<rtER P'J'I tlltt"17C Ihe ourm:e nf 'this f<rogran is to verify x<Inirx<w 480V voltares are adeouate for startin3 and fun<<ing 400V safety loads at tte mini
.r< alterable 4-LY shutdo<rn h>evd v)t tag of 392OV (lover degraded voltage se\\tino) 4-kv Shrrtdo n Board A (39<OY Assuocd)
Transforrrer TSIA.750 XVA~
2-5.94 Percent'5 Percent Boost Tap) 22 480Y Shutdo<m Board lA ASSI44PT ICHS The 4.'kY shutdown board vol taqe ls 3920Y.
Z.
Both 48CV boards are fully loaded Shutdo< n Board IA - 750 KVA P.85 PF Reactor HOV Board 18 - 498.8 KVA 8.85 PF 480Y PEOUIREHEtlIS Hini<rxxa rrc<tor starting and running voltage Is 90s (460Y) v 414Y Ass<axing a raxfxxxx 5 Percent voltage drop In the arotor feed cab)e, the nfnfnur< steady state board voltage Is:
95K (Ã) ~ 414V X - 436V APPROACH The circuit at the left 4M<is r<A<ttyzblfor the startup and nornal runninn of the laraest shutdovn and reactor HOV board eotor.
4-LV shutdo<m Board A <ras chosen because this board feeds the largest 400V rotors. and therefore presents the '<rorst case.
EVALUATIONOf IRITOR AIIO BOARD VOLTAGES 400 lvH Contml Bay
'Mater Chiller 205 (Largest Hotor on Board)
AS)G 4 Drysel1
~~178, 340 Blosaex'Largest thtor on Board)~~
A)7G 4/0 ) R~.0024 2/5. 909 X~.0019 55 48OV Reactor HOV Board 18 All board and notor voltages are acceptable.
Control bay vater chiller voltage uas 1 volt less than required starting value.
This Is not considered significant due to the extrene worst case loading considered.
All 480V shutdo<m board XFHRS are laced on 5 ercent boost ta ROTOR AND BOARD VOLTAGES STARIUP YOLIS STEAOT STATE IIP
ÃARO
<<OTOR OOARO I43TO<t BOARO tu::IROL BAV IJ<1Uegn {
) are ninfn<r<r acceptat)e.
~ ~ A ~ ~ 44
~ ~ ~ ~\\ ~ 9
~ ~ 9 lENkESSEE s/ALLEV At>fttORlSV aa CTT OI' v 4>o>t ct r9229>vcr 8'weotg CO 4449 ~ C
~ 4 SM
~4 ~ 9 7
C 9%C 9 2 0 ~ 9
~ A ac y/>X/4~/
rrc:3rva Illl'i64. -B.~CS -0 I'e purPOSe Of theSe prngraOS iS tO eValuate VOltageS aSSOCiated talth unit 3 LOCh aoi!s b.ing fr! froct lie comon statio/5 service transfcTTAers, lie steady-sta!e cziniaz){rt shutdclan board voltage is 3920'/.
161-kY Swi tChyard
~ (16c-kY Ass{>ted)
H Cocnt)n Station Service Transfo>ster A
(2-1/ZS Boost Tap)
Ass trl)Lions l.
The 161-kY switchyard voltage Is 162 kY.
2.
All unit board 4-kY Tt)tars are rs)nnlng, and all 4S'lY OA rating at 0.85 PF.
NIIT BOARD 3C Unit b,ard 4-'kY at>tors ZT905 tfCSG7 Unit board 480Y XFHRS None transfort)ers are loaded to UNIT BOAI'.0 34 7.09@ 91)f7%Y
.85{VI c'i
.5268 Start Bus IA X
T 10 Start Bus 2A Total 4.2908+j 1.8337 4.9406 +I 2.2635 NtA l
3.
Cotron board A load Is 3.417 COS.85
~ 2.9045 c3 1.8000 )l/A.
4.
All shutdown board aotors are running and all 480Y transforoers are loaded to their OA rating at
.BS PF.
Cocoon C>ard A Unit Board 3C 400 Is/al 1/e.:2;-".'W Unit Board 3A 500 IIEH 3 R40.00064 3/e, 825'J X-0.0169 Shutdown Sd Ikstors Shutdown Bd XFHRS SIRITOO((H 80 3 EA KX695 +j ).0%97
.6375 ci
.3951 SIDITNNll 80 3 EB 5'R9Y CT).OYS Hor.e 3.0070
+J 1.4546 2.3695 93 1.0595 HYA C,
Sh5)LJown Boards 3EA 4~34 YQl I/OS 295'l{p.
Switchvazd, Board, and llotor Yoltaces 3EB CS AWG, 2/0 1/e,415'oadlno Results 2-9 al 9 {ZZ/44/29ZTA): )9.4/25./
449TA44 T-'Binding (9.9/13.2/16.5 PNA) l Hone ll.ll/aal 9 {2{,9/29.2/94.5{CA): )9.4)25.2 INA The desi n Is ade uate for this case.
I'OAa.r
'{P I
Board Startup I)OLATr XA/
Board Steady-State KY Ib'xr Board Proara{n CC)2 Unit 3.5c7
(<o.Z) 3.7nl (87 0) 3.916 (9/.9) 3.947 SA f, 88 (94.9)
PHR
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2>4I
~
0 2 v
3.637 3,657 3.917 (90.9)
!89.2)
(97.9) 3.923 (94 3)
CS Shut-down
~~3. 813 (95.3) 3.835 3.916 (212.2)~~
(97.9) 3.923 (94.3)
PH'NO CS, 2~0 3.559 3 517 89.21 I 28h,5 3.50~
1 597 (ant.h)
(06.5) 3.917 (97.9) 3.916 (97.9)
(94.3) 3.923 (94.3)
(s 4 i>I (l4.16 kv)(sa kv)
(14.)6 kY)
~ra ~I ~ ~
O~.85
~ 3 ' I TCHHKSNEN VALLKYAUTHORITY
%uoJrcT.
rnOJeev BROHNS FERRY OZFOSloORP oo osroso
~ i pp 83 ~ 58 Q
fZS ZS/
csroclls ~ ~I r~s s'ts::225.8,.I I.o lose ou~w8ie of t"~se Isogra4s is to evaluate voltages associated osfth unit 3 LOCA load heir q suer:is 4 fsoos the unit 3 SIio-kY iource.
lhe ooiniruo allo~able steady-state shutdoun board voltage is 3920Y.
500-kY Sssitchyard (465 Y Assursed)
Inin Transforoser (2-1/2 percent Boost Tap)
INIIT BOAPO 3A 4-kv Unit Board Hotors
~09(N3 aa I.T367 480Y Transforners
,eSOO og
.5268 IPIIT EOAPO 38 i09O6 8~6
~SSOO
.SISI ASSUHPT 1016 1 ~
'The 500-kY sositchyard vol ta9e ls esinlnsav (465 k'Y).
2.
All unit board 4-kY actors are running, and all 480V transforvoers are loaded to their OA rating at 85 PF Total 4.9406
+3 2.2635 4.9406 8) 2.2635 NYA H
Unit Station Auto Tap Chanoer (St Boost Tap) 3.
All shutdoom board 4-kV aotors are running. and all 48t)Y transfonssers are loaded to their OA rating at
.85 PF.
Service Transfnr~r 38 SI:uo dlo.rn I'ao 5
3EB 51 asVI SI Ii IZP. Zoc ~
0
.AMG 2/0
'I.IN, 415'S Unot euard OA 500 IK'I.3/II.BZS' (18 fjrY54 53 olng) 64 Unit Proard 38 3EC 3EO SIRITOOSIN BO 3EA 8 368 4-kV Shutdossn Board Htrs M38~+3
.1189 Issr 3
3 sloners,53l~5.3351 Total 5.3164 i) 2.5140 1.0ADlNI8 RESU'TS USST X-HInding (12/16/20 HYA):
11.4 Q~ H'IA USST Y-Hinding (12/16/20 HYA)I 'll 1 LZZo NYA USST H-Hinding (24/32/40 HYA):
23.0~ HYA SINITOOUII BO 3EC a 3 EO I O~SS '3285
~8325
.5533 5.6314 aJ 2.6120 1IYA
)(DTOR AND BOARD VOLTAGES Motor II ~
ZOA 5 IASP. I
~
13 sl IIP KY 3.E64 loI 6) 3.643 (81.6)
SO eo skitor 3.'941 (98.5)
So BP 3.941 (94.9)
Steady-State KV 12A ss l.:!:I (44.9)
~~1. r/A (92.8)~~
I.san (90.5) l.g I1 (ne 9) 1<8 l.'isos RHR 20P9 (89.9) 7.844 (81.1) 3.44 I (48.5) l.'jay (94.9)
IZC Zo CS 3.611 (90.3) 3 r24 (81.1) 3.9 an (90.5) 3.9 sf (94.9) 1ZO
(: akv) fs 4.)5'kY)(s 4kv) (s 4.)6IY)
~ va ~i~ I is Ci'<< ~ I ~II vuovcci TENNESSEE VALLEV AUTHORCVV v<<<<in roc<<<<acr BRIVACS fEPoY 02.
ce~<<<<<<<<<< ~ ~ gg Pag <<RA"5 ?<A, -8
-C, A -D c~c%I ~ ~i
~cr
&<<t g/rd/alp ASSIDS<<1185
~ he purpose of these proorans is to evaluate voltaces associated with unit 3 LIXA lnah hoinn sulnliid fro<<a the cooling to~er trinsfc.~ers.
The ninirm allo able steady-state shutdown board voltage is 3920V.
The 161-LY swltchyard voltage ls 164 LY.
All cooling tower 4-'kV aotors are runnlno and all 480Y transfotvvers are loaded to their OA rating at 0.85 Pf.
161-kV Switchyard (164-kV Assc~cd) 4-kY Ik<<tors 480Y Trans!oruers Cooling Tower Swltchnear A or 0 7.2571 a3'.)m 5.1000 ai 3.1917 Cooling Tower Transformer I
(2-1/2 Percent Boost Tap)
Total 12.3571 a3 5.5460 iIYA 3.
All shutdo<<m board aotors are runnino and all 480V transforuers are loaded to their OA rating at
.BS PF.
Shutdown Boards 3EAi3ED<<3EC~3EO C nling Tuner S~itchoear D
Coollnn Tower Swltchgear A 4-kY Iistors 480V Trans forv<<ers 9.4779
<3 4.2378 I.5300~i
.9472 Shuth~nm Boards 3 EA ann lci I/O ~
295'/,"..3745'<<2 DIof.
4 j.0384 og<<3 LK'I (2 '0973 I).00)44)
I/11.415'us Tie Board 3
EC 3 EO Total 11.0079 a( 5.1860 WA LOADINCi RESULTS
~
X.MInding ( 15/20/25 IIVA).
13 5 ~o I'.VA Y-Minding (15/20/25 WA)t 25.7 ~24,7" RVA (IOZ.BS of 25 IIVA)
II-Minding (30/40/50 MYA):
39.3 ~24.5o If/A The Z.st overload on the T-winding is acceptable until the operator can droo the cooling tower load.
pil'a MOTOR AND BOARD VOLTAGES CS i~hagi i<<<<de
<<<<<< f
<<<<i<<M.
Motor 5IAnIU>
EV
(
STEADY-STATE kv SO BO
~~Iv3lnc SD Bg t?) Inn PROEZAS CS RHR 2000 3.685 (92.1) 3.838 (96.0) 3,626 (on 7)~~
>. 63n (nn.s) 3.715
'.9ZB I
Ino 3)
(98
<<)
3.060
'.927 I
F92.8).'98.2) 3.651 i 3.928 (87.0)
I (98.?)
3.651 3.oi?
(r?.0)
(or..ZI 3.n34 (94 <)
3.934 (94.6) 3.434 (94.6) 3.<<134 (94.61 20A 208 200 (s akv)
(k 4.16kv)(s akv) (s 4,16sv
ENCLOSURE 4
SCHEDULE OF MODIFICATIONS The modified electrical system descr ibed in Enclosure 2 is the
,, proposed permanent arrangement of modifications to correct potential conditions of under voltage.
The electr ical system of unit 3 will be configured as described in Enclosure 2 with the exception of cer tain instrumentation and control
('l4<C) bus modifications, upon st;artup after tl>c cycle
>t refuel.tng outage.
Because of delays in equipment delivery the mo<tiftc<rtton on the 1?0-volt; nc power system identified Ln subsection 8.tl.3.1 and shown on figures 8.tl-l nnd 8.>t-2 of section 3 will not be Lmplemcnted during the fall 1981 outage.
This modification will be i
1 ented on the IAC power system for unit 3 during the r efueling C
tern outage now scheduled for spring 1985.
In the interim, the II<<
sys em will remain in its present configuration as shown in the Browns Ferry Final Safet;y Analysis Report, Chapter 8 figures 8.6-1 and 8;7-1, with the auxiliary power syst;em's degraded voltage limit maintained at the existing limit (3920 volt) to ensure proper system operation.
I'I
VJNIT STATION SERVICE TRANSFORMER Ie (TUSSIB) 3V,207(LTC IO9')4./6-4.I6KU 2GSMVA l2/l6hlVA(X WINDING) l2/l6AIVA(V WINDING),OA/FA 7USSIB X
Y ZHX=IGOZW ZHY=l6 02 9'Hv
=Bren /
ON 24 hfVA TO SDDKV 5WITCHYARO BAY Zl (45H500) ro COOLIHG TOWER 4THEH5 THAHSFORHER I i6IKV LIME THIHITI'O COOLTNC TQIER l6UIV LIME THAHStoelIER I UNIT ST4TIOM SERVICE TR4HSFORNER IA (TUSSIA) JS.
20 1-4 l6'-4 l65f'4/32/4OIHVA IZPIG(20 MVA (X WINOUVG) l2 l6/20 hfVA(Y WINDING)
OAIFA/FOA TU35lh y IHK-l658%
ZHY l3 l3 lt, ZXY 29.64th QV 24 hfVA (I
I Ow 400 HVA AS - l6 95 S'-lt 05 CS-l6 95 5V500-3) rrsesoo-sl CDNNOH STATION SERVICE TRAHSFOIWERS A S 8 (TCSSA 8 TCSSSJ Ja l6I.4 l6-4 l6KV ZI 9/29 2/36 5 tlVA, IZ/l6/20 NVA (I WIHOINGJ 9 9/IJ 2/l6 5 HV4 (Y WDIDIHGJ. OA/FA/FOA Yzrcsse 0
ZHX = 8 T25 ON IZ HVA X
NAIH TRNI5FORNER I 3 la, 500207KV l200 NVA FOA 88 Y
8 X
8 y
Im 524XOH99IIVA IKY = l5 ISX OH 9 9 NVA UH(t STATICW SEHV(CE THAH5FOHHER 2e(TU5526) satE 4
tussle 0
( 4I6DV UNIT START
'ohpo 2
)ISI2 Sl)I5/4 ((45/Qfe)
GENERAtOR SPEAKER ZHX=/6 02 9'HY=I6 02 %,
zxv = zs.e4 TQ ON 24MVA CEHERATOR I
~~22KV, f2SO Hl'A 0 9PF, 75 PSIG HI HO )l4IG~~
)I4I6 Kc START SIS 24 START 505 2R 3000A 70 5OOKI/ SWITCHVARO BAY 24 (45N500) 2 ON 40ONVA At-l7 39 Bf-lt3'/
C I'-lt 3 V UNITSTATIONSERVICE TRANS FOR AIER 2A(TOSS?A)
SAME AS (TOSS/A)
MAIN TRANSRJPMEP 2 3-I I', 500 207KV l200 hniA, RIA 22KV/2SOMVA 0 9PF, 75 PSIG Hz ON 24 AIVA ZHX i602N 224 GEYEPATOP BREAKER ZH Y. I2 36 ts XY 3QOO 6 GENERATOR 2 CONTINUEO ON l5W500-3 N DIES; THE TEAIFOPARY AfAIFITENANCEFEED FOP THE ID (E 2DI 2E 4SOV IWACIQR MQV BOARDS MAYONLY BE ENAIXED AN(t USED DURING THE COLD SHUTDOWN "REACTOR AIOOE AND MAY NOT IH USED DURING THE'POWER GENEaATION OP IIOT 57ANOBY MODES (LICENSING PEQUUTEhtENT)
)II22 HO HG SET l4 N
II24 Hu
)
)
HG 51T Ie
)
HO )thin l5/8 Ho )
HC 4t60V UHJT STARt SIAHO I l5I6'45NTI5)
NO f436 Nc I224 NO I536 C)/222
)
)
AM SET 2A hfG SET 2R 4KV PECPICULATION PUAfP Bol'RD 2 (45NTIS) 4(V RECIRCULATION PUMP etlhRO I (45HTIB)
START 805 IA l2OOA 8
NC)HI2
/424 NO 4KV QVITBD IA 45N72I
) D26 Nc Nc JGIM uwrr A m
) l6/2 CN 4KVPI5W500 DNO SHUTDOWN BOARD A
)U/4 l524 NO) 4KI/ UNITBD IB
)HI6 l532 NO Nc 4KV Uwlt BD IC (45N72I)
(4 5 ~ 72 I )
) U32 4GOV UNITRD Ia (l5W5(Q 3)
I WATER StJPPLY BD
)l7i2ON 4KV (l5W5003)
SltUTOOWN BOARD 8 U27 NC)
I227NC)
NO SECT I SECT 4Kv cohlluow RD c (DRAW IG /v /Dzm)
)
KVA
~z-525 9 NC)
)J TVlt2 l500 it KVA
~z-s.rsv N C) 4eov w)LUIHE REDUcTIDN 6 5tx IDIFIcATIDNRo Dznn nc n 0 Rmx IB Dfltd2 SKI522 BKI2IB SHUTIKWH SIS I
SHUTOOWH. SIS 2 4KV COMMON BD A 4KVaiMMON eD R (l5W500-2)
(l5W500 ZJ STNIT SUS IB
)I2/2
/425 HO) 4KV UltIT So 2A Nc (45H/2I)
)l226 NC )
8 kC) l2i4 l526 Lo)
GIV UH(T RD 2S (65NT2I)
NC)f232 NC)
CONTKIUED ON l5W500 3 Qs m
4KV UNITBD 2C (45N72I)
NC 4KV UNIT 3C
)
~ISWSCQ-3)
PARD TFPS I AIBAUNIF l722 OHJKYBCWR~D
/ SHUTSWH
(
ZM /
H22 QV4KV SHUTDOWN BOARD D EOAHO C 480V POST ACCIDENT SAMPUNG eo SKA l642 4KV BUS T(E BOARD BKH /ra
('Svsoo-3) 48OV UNITBD 2B I'l5W500 2)
I 5'/57 +I 575%
GWATEP SUPPLY BD (l5W5OQ3)
PC)
NC)
DIESEL GEHEHATOR A, 4
IGKV J50D KVA, 0 BPF GKR /844 JKV SHUTIXWH 50 SEA (l5w5ao.SJ
)l6I4 No)lr/6 HO ) I224 4KV SHUTDOWN 50 A
)
(45N724-Il Hr
)fezz H RKR f548 JKV SHVTODVM 50 3ER (l5W500-3) 8
)ITI4 H 4KV SHUTOWN BD 8
)
HSH/24-2)
DIESEL GENERATOR e 4 l6XV Ssoo KYA, o'epr DIESEL GENERATOR C.
4 l6KV J500 KVA, 0 SPF SKR f234 JKV SHUTCOWM BD JEC U5W500-JJ 8
t65I H )ITIS HO ) leis
)
4KV 5HUTOOHN 50 C Hc )
( AGNI 24-3I Nc DIESEL GENERATOR D, 4 l6KV 3500 KVA, 0 8PF RKR f846 4KV SHUTIXWH SD 3EO II5W500-3)
HO )IGI6 H )l6IS
)N24 H )l826 JKV SHUTSWH Ro 0
)
(45H724.4t
)
S FIGURE 8.3-1 b TSIA rsoless Kvh DA/FA 1 =5 945 450V SHUTDOWN 50 (45N/49-II Nc )
Hc )
Hc IEA low Not Nor GEH GEN IQTOR CEit(RRTOR INRJT 46OV, 3i'0HZ DUHP SFECIAL.
a/IPUT)JBQV,
~~62. 5HVA,OGIF Hc )~~
Hc )
TSIE looo/II50 KVA 5
TSIR rsalesJ Kva DAJFA z=s ehx T.
)
" )Jeov Spurawe ao m "
D4/FA s
1=5 OOX (455T49 2)
)
Hc)
Nc )
Hc)
MIOV REACTOR HOV 50 th (45N/SI-I 8 2)
)
Hc )
MIOV REACTOR NOV BD IB
)
Hc )
NC)
HC)
Hc Hc MIOV CNDS DENIM Eo I
( I 5WSDD-2 J IDA HOT IKIT GEN GEH (45N75I-3 G 4) so )
450V REACTOR NOV Ro IC (45M/St-5 8 6)
~0)
TEMPOPAPV SEE NOTE I NO) hl )
450V REACTOR NOV So /0 ec )
HO )
(45H15I -7 J GIOV COMMON uc ) ao r eus e
(I 5S500 I'I NO) 480V REACTOR MOV 50 IE (45RTSI-lol KEY INTERLOCK mov cowr ehv vENT Ro A
Hc (45HT36-Ii TSPA Tso KVA OA T.
1=5 SIX Hc 1 MIOV SHUTIXSIH BD 2A (45N/49-SJ T52E looo/Ilso KVA 5
OA/FA I
6355
)
) Jaov GHuraaww ao 25 H
(45H749-4)
T52G 750 KVA OA1=5 33X
)
NC)
HC )
NC
)
HC HO GIOV REACTOR Nc HOV BD 2A (45H/5I-I 6 2J
)
HC )
Hc )
Hc )
400V CHDS DENIM SEH Sl 2 (l58500-Zi 20A TDB 300 KVA OA 1=4 TOX TOA TDE 300 KVA 300 ifVA 5
oh1=4 655
.T, MIOV DIESEL AUX Ha ) Bo 4 rhsMr51-I a N OA 1=4 755 MIOV DIESEL AUX 50 8 (45N/32 3,408)
Mo )
m ASOV RAOWASTE BD I (l5W500-2) 450V RNIHAJTE 50 I ( l5V500-2)
AKT'W GEH GEH MO MIOV REACTOR NOV 50 /S (45H75I-3 5 4)
Hc )
HC )
IfOT IWT EN GEH No
)
NO)
NO) 420V REACTOR NOV BD ZC (45H75I-5 S SJ TEAfFORAP/ SEE NOTE I GIOV REACTOR NOV BD ZD (45N75I 8)
MIOV RE4CTOR NOV 50 25 (45W75I.IIJ NO)
')
HO HC )
HUCLEAR SAFETY RELATED THIS ORRWJHG Awo CtWP4HIDH DRAWINGS /59500 2, 8
3 SUPERSEDE DHAWIHCS l5H500-I 25 S ISN500-2 Rlf INSPECTEO MQ APPROVED Foa ISSUE 5L( Zz.3 ~ Q bc - o 1
5 hirsh,f2552 1-5-79 JIM Lth F JIM 5th Jth 15 EW Llrss Asss Uov trrtct sLDV toR slit ttm ECH L2D52 ADDS UNT KCW SThhlsEh TLV tD.
5DCHHOITATIVH Css sthT KATlsst 9th trna I I L-hl 6-2-Ts sFL Ltt KAL 5th shh Jsh T9H hhhhhE TNE ALTEHHATE FINER SUPPLIES TD 'IW salt ash th, rt, t tC ECWP-Wtl MCIMhhTITISH CHASSE VSLT.
INI ISrhlfhL HAlt h(twlRED ECS L-lu J
H MAYO R
W, STD)EHS G ~
IHSSITT J
G SAVERY Dht GGLLEtHTS GENERAL UNITS 1
& 2 EXCEPT AS NOTED KEY DIAGRAM OF STAND BY AUX POWER SYSTEM BRONNS FERRY NUCLEAR PLANT TENNESSEE VALLEY AUTHORITY D
5 OH D
EHS st I S
DES 4 XHO ILLZ 67 E
15N50 1
R9 E(Np(UNnhhpo Jc cn Jam m I/
m foYMISJ hvo 4
/sdchmshddrtHnhmbdsco 53(E(npo37/ldb/
ps I msn/t ffdf Mov hw/a Movbdsio/Ezpszz. ps/eh ~dd ng n'
DQ:
/
5 c'/ './K
.d 8
0175
'll Itz L58445 ECN P-0 IS I/S 7
DZ73 itt
/460 VHN CSH Dlz JH 4
JHR FW aves USSTZB /Imoomfl unh/ fm/brco eI va lab*f4 /nh/a lehm ECN I'U
/
seal D<>
~~I 0~~
~~CN PQ2I4 INSTALLS GctQIUOP IWEAKFRS ECN PO275 ADDS UlvttSTMION EFMICE tltAKORIIJHEKS CHANGFShatmtL FEED RW 4KVSHUN XWVBUS 2 ID ITROAPD 2A ECNIGIAOQSSD OlfQ MH 5 07IEP Mhat QQS ho tmts HfWKREDO~~
~~If<<JT ST4TJON 5ERVICE TAANSFOHNER IA X-WINDIIVG fl5W500-I)~~
~~<<0) ri is JKV COMMOfi HOARD A 145<<TI5)~~
~~START 805 IA (15W500-I)~~
~~NC) f422 START eus te (l5W500 Il RC) f572 4lfV CoflMON HOARD 8 145<<JI51 UNIT STATION SERVICE TR4HSFORHER 2A X-Wl<<ol<<G (15W500-Il NO) f218 M) c)~~
~~Nc)~~
~~Nc)~~
~~Nc)~~
~~Nc)~~
~~Nc N )~~
~~Hc)~~
~~Nc)~~
~~PUMP A~~
~~PUMP 8 SKI. THNIMALRESEARCH FACIUTIES WATEltPliMP 8(MWOS(IBIOJECT Bl IOUS)<<7)OSI05 53N73I)~~
~~~ DIESEL RllNAAA~4 GENERATOR 1.5%~~
~~4 400KW oerF AHVSECUI<<IY IGHTINGhlCC~~
)
~~Nc) pu<<p 8 pu<<r 4~~
)
~~Rc)~~
~~<<)~~
~~HC)~~
~~MC) 62 IOOOKVA 415 TYI-I TVI.2 IY2-I TY2-2 TJ=S "5 p~~
~~p p~~
~~p f50KVA l50KVA 150KVA IXDKVJA J+a 1=3 36 1=3 36 1=3 SS 1=3 3%~I?55k~~
~~~IKVAVBM HYPtXHIORITE<<c)CQI-I CA&ajt<<)~~
~~6)C(8".-I C482.20)~~
~~BIO THERMU.~~
~~Aeov 240V DISTII 240V DISTR OFFICE~~
~~<<)~~
~~<<o)~~
~~Po)~~
~~Mc) a Ise ILDG (105-5JH730)~~
~~Ot)KV SWY NOD C 8 I DolfV SWY Nl<<l C 82 Nc GKl 7<<ERMAL PESEIUH'H FACILITIES WATERPuhfP~~
~~~AGSROJECT 83 K)5-53N73OBNG 51N73I) 4 rosa 300K I'I 4OA 2.596 ror,s 30ot VA OA 2:596 TEA IOOOKVA 04 z=eb 4KV UNIT SD 24 (15W500 I 1 (75NTOO) tES 1000 KVA OA Z=896 LIGHTING DIESEL BUILDING 4K/ UNJ'(~~
~~(454735 I)~~
~~(15W500-Il 4KV UNIT HD IB (15R51!0-~~
)
~~JKV UNIt SD IA I (F500 I)~~
~~TLS 150KVA OA 1-5 155 O'4 2 852M 6~ MMKVA ~ IuaoxvA OA 6~~
~~'OA M~~
~~2 f1 %~~
~~2=89 z 85m TL2 150 KVA 04 1=5 t53 tL I 750 KVA 04 1=5 156 TC24 750lfVA 480V UNIT SD 2A Aeov u<<rr TC28 J50 NC) 480V LIGHTING Rc) eu 5~~
~~po) 80748078 ao lc 240V LIGHT NG 804105 (45<<734 3~~
~~80 28~~
~~) rss<<741-No)~~
~~Pc)(45<<747-N )~~
I)
~~Nc 21~~
~~+)T)T)+)~~
~~Jeov 480V LIGHTING Ro)eo i~~
~~Uc)~~
~~C NC Nc~~
)
~~LIGHTING )~~
~~<<0 145M 134 2 u) wav c~~ aoAeo z (45NJ29-21 HUS 4~~
~~eus 8~~
~~"k,k,kN. Mk-.~~
ZZZ NC)
Mc )
Nc)
)
~M)
~)
Rc )
Rc)
Hc 480V XF<<lt YRO CAB 2 (75<<101) 480V TURBINE BDAIIO 386 BUILDING Vff<<<<s (lbJHII83)"
TC34 IDPIYIISOHUA zo-eS MIOV IFMR YRD CAS 480V XFMA Yeo CAH 3 Jeov JFMR YRD CAB 2 IIFMlf VRD CAS I
175NTOI)
M5VTOI)
SC IA 0 IX U IC SD 2A SD 28 80 2C 240V I.IGHTING HOARDS (45N13'-IS 2) 48ov UNIT 805 3AI 38 (15W500 3)
I*)
)- -
6)
IC38 4 ~ DAIIIA z=es M%V HI II ms<<153 3 8 4)
No(
480 I I IVE tloV 80 ZC Nc I No)
(45N/53 56 6)
/
480'OMMOH BOARDS 3 (45N729-31 R )
RC)
~)" )
dlls A
Nc)
<<0)
JBDV TURBINE HUILIING VEflT 80 (45<<T57-2)
RC )
Rc )
Rc) 4IIOV TIIRSINE NOV Nc )
Rc )
Jeov rueliiE scot VENt HD SA S TURBINE HOV 00 3A (ISWSM-3)
TCIA IOOOIII50KVA OA/FA z=es flC)
Ho)
~IIC)
N )
'b/uvfa(UHSJNE (1511500-3)
JBDV CONTROL SAY VENT Bo 8 IISA500-3)
SUILDIRG VENT ASOV I'EACTOR SOAADS 3A 8 38 (15R500 3) 480V Wl 'A 8 OIL STOIIAGE GD (15ltruul Hu)
HC) 480V TURGJRE HUJLOJNC WOV TURBINE MOJ 80 Ie (45H753 3 8 4) 4801'HUTDOWN SD 28 W500-I I rcie 6 MC )
po) euS A m~805 8 480V COMlftW 41480 (45N729-I)
VENT Bt)ARD 2A 5
)4 (4(NI I I)
I,C)
OAFFA RC)
.Vc)
Ho)
Nc)
SDV AfiXILJAAYSOILEII HD 805 4 (45<<745) 805 8
"))
480V TURBXIF 80(LOING VENT 80 IA (45H157-I)
Nc
<<0)
)
480V SHUTIOIYM HOARD Ie (15W500-I) 46 V TURBINE MOV 80 IA
)
(45N753 f 8 2 1
HC) io
<<0 (45<<753 IS 2) 4IOV DIESEL AUX HD 8 Rc) fl5W500-I)
"*)
)
-)
M JSDV DIESEL AUX BOARD A N )
(15W500-I)
MC)
)
4)
Nc
'*)
-)
In 4tlov CONTROL BAY VElt BD A (Iet5JJ Nc
<<0
)
")")
WJV CONDENSATE IXMJltER4LIIER SD 2 (45<<759)
ISDV IKW STIIAIHER VALVE SD (45W746-1112)
<<)
MC)
TSBB UPP/lisoKvA 480V R(4CTOR BUILOI<<6 VENT SD ZA 1=83 (45H755-I) ress 1000/1150KVA OAIFA z=eS 480V RADWASTE 80 2 (45<<7M&2) 480V R41WASTI SD (45NT43-I JSOV COHOEHSATE OENINERALIZER Bfl I (45N759)
N)
R )
480V SERVICE HUILOING HA(M SD 145N13T)
<<)
NC) 410V RE4CTOII Bill(DING VSBT BG 14 480V REACTOR HUILCING VENT au IB 145NJ55-2 I 4IOV SERVICE SLOG vr<<r so << As<<r35-i)
H)
H)
H)
CA 2 CA 4 CA 3
CA 5
~SOV SEOVICE SUILOING NIWEP csa'ts 145N739) ac)
Nc)
(45('74I )
(45<<139) 480V OFFICE BLDG I ABOVSEHVKE VEHT eoARD Hc(
BUILDING WWER CABINET I
<<3)
Hc)
Nr)
~)-)
4IOI'4DNASTE SD I (4HI144-Ie Zl 480V GATEHOIISE P4HEL 80 (45HIJI)
NC)
SD I
80 2 240V OFFICI BLDG LGt 240V SEIIVICE BLDG LIGHTIH SOA 05 (45<<JJT) 480V SERVICE HLOG VEHT SD 2 145N738-2)
Asov REIcrue eurior<<0 vERr 80 18 (45N155-2)
T<<15 Dlf IEING 4<<D CONFANJOP ORHIINGS 15V500 I, 6.3 SUPERSEDE DRAWINGS 15<<500 I R5 8 15<<500-2 RI4 HCY
<<01
<<Ol HC) 480V OFF GAS MCC A WOV OFF GAS MCC 8 IISHTOI-I)
(15HTOI-2) ris<<Mr 8 Ssvmr-I)
FIGURE 8.3-1a I
':4
~ 158 SJB Ecmpozs6 sf Bd forys/d/io Jim)s ssfu iydiud>> n y em CHIP 0275 CI u B4Kv(o bd8 J))1 Mfm/'UST?
/01US52A (MPOZTJXN/s'fvscddisco nvcksniich/oon~moFMHFABIUJA Jl
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